{"title":"Pallasites","description":"\u003cp\u003ePallasites are stony-iron meteorites made mainly of olivine crystals held in iron-nickel metal. Cut and polished, the olivine can transmit light, and etching the metal can bring out its internal structure.\u003c\/p\u003e\n\u003cp\u003eThe Meteoritical Bulletin recognizes the main group pallasites (PMG), the Eagle Station group (PES), and pallasites that fit neither group, listed as ungrouped or anomalous. Some entries are recorded simply as pallasite with no group assigned. Each classified specimen here is listed with its classification exactly as the Bulletin records it.\u003c\/p\u003e","products":[{"product_id":"sericho-pallasite-92-48g-etched-part-slice-kenya","title":"Sericho Pallasite Meteorite Part Slice, 92.48g, Etched and Stabilized","description":"\u003ch2\u003eProfessionally conserved pallasite from Kenya's Habaswein find\u003c\/h2\u003e\n\u003cp\u003eThis 92.48g part slice exposes the internal architecture of the Sericho pallasite through controlled etching that reveals both the iron-nickel matrix structure and the boundaries between metal and olivine crystal phases. The specimen has been stabilized using museum-standard conservation methods: Paraloid B-72 applied to cut edges and microcrystalline wax on polished faces. This treatment preserves the meteorite's structural integrity without adding epoxy weight, ensuring the listed 92.48g represents actual meteorite mass. The part slice format displays a cross-section through the stony-iron structure, showing how olivine crystals are distributed within the metallic host.\u003c\/p\u003e\n\u003cp\u003eThe etching process employed nitric acid to preferentially dissolve kamacite and taenite at different rates, creating visible topographic relief that maps the metal's crystallographic orientation. Olivine crystals appear as recessed or protruding features depending on their hardness relative to the surrounding metal. The stabilization prevents oxidation and maintains the contrast between etched metal surfaces and silicate phases, critical for long-term display and study.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eThe etched surface displays the iron-nickel matrix with visible kamacite-taenite boundaries that formed during slow cooling in the asteroid's interior. Olivine crystals appear as distinct phases embedded within the metallic framework, their margins defined by the differential etching response between silicate and metal. The part slice geometry cuts through multiple olivine grains at varying angles, creating a three-dimensional view of how these gem-quality crystals occupied space within the parent body's core-mantle boundary region.\u003c\/p\u003e\n\u003cp\u003eKamacite lamellae width and orientation vary across the specimen, reflecting the nickel concentration gradients that developed during the asteroid's thermal history. Some olivine crystals show fracture patterns consistent with impact shock, while others remain intact with sharp crystal faces preserved at the metal-silicate interface. The stabilization treatment has locked these features in place, preventing the oxidation that typically degrades iron meteorites in terrestrial environments.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003ePallasites formed at the boundary between a differentiated asteroid's metallic core and olivine-rich mantle, likely through impact disruption that mixed these layers during the solar system's first few million years. Sericho, a find from Kenya with a total known weight of about 2.8 tonnes recorded in the Meteoritical Bulletin, is one of the larger pallasite recoveries, with material showing exceptional preservation of both metal and silicate phases. Olivine crystals in pallasites provide direct samples of mantle material from asteroids that underwent the same planetary differentiation processes that created Earth's internal structure.\u003c\/p\u003e\n\u003cp\u003eThe iron-nickel host crystallized from molten metal at temperatures above 1400°C, then cooled at rates between 1 and 10 degrees Celsius per million years. This extended cooling period allowed nickel atoms to diffuse through the crystal lattice, creating the kamacite-taenite intergrowths visible after etching. The Meteoritical Bulletin database lists 221 entries in its pallasite category as of September 2026. For comprehensive background on meteorite formation and classification, see our \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e guide.\u003c\/p\u003e\n\u003ch2\u003eThe story\u003c\/h2\u003e\n\u003cp\u003eSericho’s recovery began with lost camels. According to the Meteoritical Bulletin, in 2016 two brothers searching for their animals west of the village of Habaswein, south of Sericho in eastern Kenya, came across several large, unusually dense stones. There are no rocks in that area, so they decided the stones were meteorites, and they spent several weeks moving them home to Habaswein with engine hoists.\u003c\/p\u003e\n\u003cp\u003eThe stones were not new to the people who lived there. The Bulletin records that camel herders had known about the masses for decades, and that one village elder remembered playing on top of them with his brothers when he was a child.\u003c\/p\u003e\n\u003cp\u003eIn early January 2017, Michael Farmer received an email with a photo of a 107 kg “giant pallasite,” travelled to Nairobi and bought it. Two weeks later he returned to Kenya with Moritz Karl and went to Habaswein, where they were shown more than a ton of specimens stacked in the courtyards of two house compounds. The Bulletin records that more than 2,800 kg has been found to date.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSource: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?code=65717\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin entry for Sericho\u003c\/a\u003e, writeup from MB 106.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWhat the research reports\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin classifies Sericho as a pallasite without assigning it to a group. The original classification in Meteoritical Bulletin 106 reported olivine and metal chemistry, including olivine Fa12.3 with an FeO\/MnO ratio of 57.4, but did not include the oxygen isotope or bulk metal trace-element data normally used to place a pallasite in a group. Later peer-reviewed studies have analyzed Sericho as a main group pallasite. Their findings come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. Until the Bulletin entry is updated, this listing uses the official classification.\u003c\/p\u003e\n\u003ch3\u003eWindmill et al. (2022): oxygen isotopes match the main group\u003c\/h3\u003e\n\u003cp\u003eR. J. Windmill, I. A. Franchi, J. L. Hellmann, J. M. Schneider, F. Spitzer, T. Kleine, R. C. Greenwood and M. Anand, of The Open University, the University of Münster, the Max Planck Institute for Solar System Research and the Natural History Museum, London, published \u003ca href=\"https:\/\/doi.org\/10.1093\/pnasnexus\/pgac015\" rel=\"noopener\" target=\"_blank\"\u003eIsotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System\u003c\/a\u003e (PNAS Nexus, volume 1, pgac015, 2022).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOxygen isotopes.\u003c\/strong\u003e Two Sericho olivine samples gave Δ17O values of −0.202 and −0.200 per mil, within the average the authors report for main group pallasite olivine of −0.197 ± 0.016 per mil. The study places Sericho with Seymchan in a low aluminium and manganese subgroup, noting that \"Sericho and Seymchan exhibit variable olivine–metal ratios yet have unresolvable Δ17O values.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFormation.\u003c\/strong\u003e The authors found an oxygen isotope mismatch between olivine and chromite in main group pallasites. They interpret it as evidence that the metal and the olivine came from two different bodies brought together by an impact, rather than forming together at a single core-mantle boundary.\u003c\/p\u003e\n\u003ch3\u003eJung et al. (2026): weathering and magnetism\u003c\/h3\u003e\n\u003cp\u003eJ.-I. Jung, S. Gaal, S. M. Tikoo, E. Lopes, J. Mells, D. H. Burns and R. G. Hatfield, of Stanford University, the University of Alabama and the University of Florida, published \u003ca href=\"https:\/\/doi.org\/10.1111\/maps.70217\" rel=\"noopener\" target=\"_blank\"\u003eMagnetization records of terrestrial weathering in the Sericho pallasite\u003c\/a\u003e (Meteoritics \u0026amp; Planetary Science, 2026).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClassification in the study.\u003c\/strong\u003e The authors describe their sample as \"the main group Sericho pallasite.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFindings.\u003c\/strong\u003e Their sample contained fine magnetite grains inside iron oxide veins, likely goethite, formed by alteration after the meteorite reached Earth. The authors conclude that this secondary material dominates the sample's magnetic signal, so it cannot be used to recover the parent body's magnetic field, and they note that different samples of one meteorite can weather to very different degrees.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Sericho is classified as a pallasite in the Meteoritical Bulletin. You can verify the classification at \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Sericho\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003ethis MetBull search link\u003c\/a\u003e. Each specimen includes a certificate of authenticity documenting its provenance from the 2016 Habaswein, Kenya find.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does \"stabilized\" mean for this specimen?\u003c\/strong\u003e Stabilization refers to museum-standard conservation treatment using Paraloid B-72 acrylic resin on cut edges and microcrystalline wax on polished surfaces. This prevents oxidation without adding significant weight. Unlike specimens coated in thick epoxy, this piece's 92.48g weight represents actual meteorite mass, not resin filler.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e The specimen weighs 92.48g and includes a certificate of authenticity. No display stand is included unless specifically noted in the variant details.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy do pallasites show such distinct crystal and metal separation?\u003c\/strong\u003e The olivine crystals and iron-nickel metal represent two immiscible materials that could not mix when molten. They originated at the boundary where the asteroid's liquid metal core contacted its solid olivine mantle, either through impact disruption or density-driven flow processes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow should I store this etched and stabilized piece?\u003c\/strong\u003e The conservation treatment provides long-term protection, but store the specimen in low-humidity conditions away from direct moisture exposure. The stabilization prevents oxidation under normal display conditions, though extreme humidity or liquid water contact should be avoided.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eSericho material combines scientific interest with a clear, well-defined olivine and metal texture when cut and polished. The 2016 discovery provided the first significant pallasite material in over a decade, and specimens with professional stabilization treatment offer preservation quality typically reserved for institutional collections. This 92.48g part slice provides substantial size for display while maintaining the internal structure visibility that makes pallasites valuable for both collectors and researchers.\u003c\/p\u003e\n\u003cp\u003eThe etched and stabilized preparation demonstrates proper conservation methodology, distinguishing this specimen from untreated pieces that deteriorate over time or epoxy-coated examples that obscure actual meteorite content. Collectors seeking stony-iron meteorites value Sericho for its combination of structural clarity, gem-quality olivine, and reliable provenance from a documented find. Browse our complete \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection to compare this specimen with other core-mantle boundary samples.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Sericho\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003eSericho\u003c\/a\u003e | Classification: Pallasite | Find, Habaswein, Kenya, 2016\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44856860016687,"sku":"SERICHO-92.48G-SLICE-ETCHED","price":650.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/IMG_7506.heic?v=1768096544"},{"product_id":"etched-stabilized-gyarub-zangbo-pallasite-full-slice-94-90g-true-weight-no-epoxy","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped, 94.90g, Etched and Stabilized","description":"\u003ch2\u003eA 94.90g etched full slice of Gyarub Zangbo, stabilized without epoxy\u003c\/h2\u003e\n\u003cp\u003eThis is a 94.90 gram etched and stabilized full slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. It keeps its natural irregular outline, the metal is etched, and it is stabilized without epoxy so the stated weight is the meteorite itself. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eThe slice keeps an irregular natural outline around its perimeter. Olivine is dense across the face, from small grains to larger elongated crystals in yellow-green, amber and brown. The lightbox and dark-field photographs show a large share of the crystals transmitting orange and gold light, with the fracture pattern inside each grain visible.\u003c\/p\u003e\n\u003cp\u003eThe edge-on photograph shows the thickness of the slice and its rough natural rim.\u003c\/p\u003e\n\u003cp\u003eThe metal has been acid etched to a frosted finish that brings out the kamacite and taenite intergrowth the Bulletin records as the metal phases in this meteorite. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eThis slice is not epoxy coated. The edges are sealed with Paraloid B-72 acrylic resin and the cut faces are treated with microcrystalline wax, both reversible conservation materials, so the stated weight is the meteorite itself rather than meteorite plus a coating layer.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the weight stated as true weight, no epoxy?\u003c\/strong\u003e Many stony-iron slices are sold with coatings that add to their stated mass. This slice is stabilized only with conservation materials, so the 94.90 g is the meteorite itself.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is this slice stabilized?\u003c\/strong\u003e The edges are sealed with Paraloid B-72 acrylic resin and the cut faces are treated with microcrystalline wax. Both are conservation materials that can be reversed, and neither is a coating that adds bulk to the stated weight.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The 94.90g slice and a Treasure Coast Meteorite Co. certificate card bearing its serial. No display stand is included unless separately noted.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 94.90 grams this full slice keeps its natural outline and uncoated etched metal, a preparation aimed at long term preservation. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis specimen carries serial TC-00005 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00005\"\u003eSpecimen Record TC-00005\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44856961237039,"sku":"GYARUB-ZANGBO-94.90G-SLICE-ETCHED","price":1750.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/IMG_4385.heic?v=1768101112"},{"product_id":"sericho-pallasite-meteorite-slice-pmg-9-33g-olivine-in-iron-nickel-matrix","title":"Sericho Pallasite Meteorite Slice, 9.33g, Olivine in Iron-Nickel Matrix","description":"\u003ch2\u003eA polished cross-section of the Sericho pallasite\u003c\/h2\u003e\n\u003cp\u003eThis 9.33g slice of the Sericho pallasite puts one of the most structurally interesting meteorite types directly in hand. The polished face exposes a dense mosaic of olivine crystals suspended in a continuous iron-nickel matrix, the characteristic texture that makes pallasites immediately recognizable and unlike anything else in the natural world. Sericho is notable for its unusually high olivine crystal density, with estimates placing it at 70 to 80% olivine by volume, well above the 50% typical of most pallasites.\u003c\/p\u003e\n\u003cp\u003eThe olivine in this specimen has terrestrialized over its time on Earth, shifting from its original green toward amber, brown, and deep black tones. This is a natural and expected consequence of long surface exposure in Kenya's environment, and the resulting color range gives the slice a rich, layered visual character. Metal-rich zones between the crystal clusters show the brushed metallic luster of the iron-nickel alloy, and under magnification the beginning of Widmanstätten structure is visible in areas of coarser metal.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eSericho's olivine crystals are well-rounded to sub-angular, a morphology interpreted as evidence that the crystals were suspended in liquid metal before the pallasite solidified, a snapshot of the boundary zone between an asteroid's metallic core and its rocky mantle at the moment of cooling. The crystal-metal contacts are clean and sharp on the polished face, with individual crystals ranging from a few millimeters to over a centimeter across.\u003c\/p\u003e\n\u003cp\u003eThis slice carries a thin protective epoxy coating applied to both faces to stabilize the olivine crystals and slow further terrestrialization. The terrestrialization of the olivine, the progressive oxidation and color shift from green toward brown and black, is visible across the face of this slice. Some crystals retain traces of amber and green in their interiors, visible under direct light at certain angles. The metallic matrix between crystals shows polishing scratches consistent with hand preparation and displays a subdued metallic sheen typical of weathered pallasite metal.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin database lists 221 entries in its pallasite category as of September 2026, counted as database entries rather than separate falls. The Meteoritical Bulletin records Sericho simply as a pallasite, without assigning it to the main group or to any other pallasite group.\u003c\/p\u003e\n\u003cp\u003eSericho was formally recognized in 2016 when large masses were acquired from villagers in Isiolo County, Kenya, though local oral history places knowledge of the stones considerably earlier, camel herders reportedly played on the larger masses as children. The strewn field extends over 45 kilometers, with individual pieces ranging from sub-kilogram fragments to masses as large as 500 kilograms. Learn more about this meteorite type: \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003eWhat Is a Pallasite?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eThe story\u003c\/h2\u003e\n\u003cp\u003eSericho’s recovery began with lost camels. According to the Meteoritical Bulletin, in 2016 two brothers searching for their animals west of the village of Habaswein, south of Sericho in eastern Kenya, came across several large, unusually dense stones. There are no rocks in that area, so they decided the stones were meteorites, and they spent several weeks moving them home to Habaswein with engine hoists.\u003c\/p\u003e\n\u003cp\u003eThe stones were not new to the people who lived there. The Bulletin records that camel herders had known about the masses for decades, and that one village elder remembered playing on top of them with his brothers when he was a child.\u003c\/p\u003e\n\u003cp\u003eIn early January 2017, Michael Farmer received an email with a photo of a 107 kg “giant pallasite,” travelled to Nairobi and bought it. Two weeks later he returned to Kenya with Moritz Karl and went to Habaswein, where they were shown more than a ton of specimens stacked in the courtyards of two house compounds. The Bulletin records that more than 2,800 kg has been found to date.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSource: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?code=65717\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin entry for Sericho\u003c\/a\u003e, writeup from MB 106.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWhat the research reports\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin classifies Sericho as a pallasite without assigning it to a group. The original classification in Meteoritical Bulletin 106 reported olivine and metal chemistry, including olivine Fa12.3 with an FeO\/MnO ratio of 57.4, but did not include the oxygen isotope or bulk metal trace-element data normally used to place a pallasite in a group. Later peer-reviewed studies have analyzed Sericho as a main group pallasite. Their findings come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. Until the Bulletin entry is updated, this listing uses the official classification.\u003c\/p\u003e\n\u003ch3\u003eWindmill et al. (2022): oxygen isotopes match the main group\u003c\/h3\u003e\n\u003cp\u003eR. J. Windmill, I. A. Franchi, J. L. Hellmann, J. M. Schneider, F. Spitzer, T. Kleine, R. C. Greenwood and M. Anand, of The Open University, the University of Münster, the Max Planck Institute for Solar System Research and the Natural History Museum, London, published \u003ca href=\"https:\/\/doi.org\/10.1093\/pnasnexus\/pgac015\" rel=\"noopener\" target=\"_blank\"\u003eIsotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System\u003c\/a\u003e (PNAS Nexus, volume 1, pgac015, 2022).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOxygen isotopes.\u003c\/strong\u003e Two Sericho olivine samples gave Δ17O values of −0.202 and −0.200 per mil, within the average the authors report for main group pallasite olivine of −0.197 ± 0.016 per mil. The study places Sericho with Seymchan in a low aluminium and manganese subgroup, noting that \"Sericho and Seymchan exhibit variable olivine–metal ratios yet have unresolvable Δ17O values.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFormation.\u003c\/strong\u003e The authors found an oxygen isotope mismatch between olivine and chromite in main group pallasites. They interpret it as evidence that the metal and the olivine came from two different bodies brought together by an impact, rather than forming together at a single core-mantle boundary.\u003c\/p\u003e\n\u003ch3\u003eJung et al. (2026): weathering and magnetism\u003c\/h3\u003e\n\u003cp\u003eJ.-I. Jung, S. Gaal, S. M. Tikoo, E. Lopes, J. Mells, D. H. Burns and R. G. Hatfield, of Stanford University, the University of Alabama and the University of Florida, published \u003ca href=\"https:\/\/doi.org\/10.1111\/maps.70217\" rel=\"noopener\" target=\"_blank\"\u003eMagnetization records of terrestrial weathering in the Sericho pallasite\u003c\/a\u003e (Meteoritics \u0026amp; Planetary Science, 2026).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClassification in the study.\u003c\/strong\u003e The authors describe their sample as \"the main group Sericho pallasite.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFindings.\u003c\/strong\u003e Their sample contained fine magnetite grains inside iron oxide veins, likely goethite, formed by alteration after the meteorite reached Earth. The authors conclude that this secondary material dominates the sample's magnetic signal, so it cannot be used to recover the parent body's magnetic field, and they note that different samples of one meteorite can weather to very different degrees.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Sericho is an officially classified meteorite with a Meteoritical Bulletin entry. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=65717\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Sericho\u003c\/a\u003e. This specimen ships with a Treasure Coast Meteorite Co. certificate of authenticity. Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the olivine dark rather than green?\u003c\/strong\u003e The olivine in Sericho has undergone terrestrialization, a natural oxidation process that occurs as olivine crystals react with Earth's atmosphere and moisture over time. Fresh pallasites have transparent green to amber olivine. Sericho's surface exposure has shifted the color toward brown and black in most crystals, with some retaining amber tones in their interiors. This is characteristic of the Sericho find and does not affect the meteorite's authenticity or scientific significance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs Sericho a main group pallasite?\u003c\/strong\u003e The Meteoritical Bulletin classifies Sericho as a pallasite without assigning a group, because the original classification did not include the oxygen isotope or metal trace-element data used to assign one. Later peer-reviewed studies have analyzed Sericho as a main group pallasite, and its olivine oxygen isotope values match the main group. Until the Bulletin entry is updated, this listing uses the official classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The 9.33g polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate of authenticity. Note: this slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003ePallasites are one of the few meteorite types that require no scientific background to appreciate immediately, the olivine-in-metal texture is visually self-evident and unlike anything terrestrial. The Meteoritical Bulletin records a total known weight of about 2.8 tonnes for Sericho, which is why it is one of the more accessible pallasites for collectors. For collectors building a type collection, a Sericho slice fills the stony-iron category with a properly classified, documented specimen. Browse our full \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=65717\" target=\"_blank\"\u003eSericho\u003c\/a\u003e | Classification: Pallasite | Find, Isiolo County, Kenya, 2016 | Total known weight: ~2,800kg\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45263722676271,"sku":"SERICHO-9.33G-SLICE-EP","price":75.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/sericho-pallasite-meteorite-slice-9-33g-hero.jpg?v=1777516252"},{"product_id":"sericho-pallasite-meteorite-slice-pmg-17-39g-olivine-in-iron-nickel-matrix","title":"Sericho Pallasite Meteorite Slice, 17.39g, Olivine Crystal Mosaic","description":"\u003ch2\u003eOlivine crystal density in a compact pallasite slice\u003c\/h2\u003e\n\u003cp\u003eThis 17.39g slice exposes the classic pallasite architecture: olivine crystals distributed through a continuous iron-nickel matrix. The polished face shows crystal clusters separated by metal veins, with the olivine occupying an estimated 70 to 80% of the total volume. Individual crystals range from several millimeters to just over one centimeter across, well-rounded to sub-angular in form.\u003c\/p\u003e\n\u003cp\u003eThe olivine has terrestrialized during surface exposure in Kenya, shifting from green toward amber, brown, and deep black. Metal zones between crystal clusters display the brushed metallic luster characteristic of the kamacite-taenite alloy. Both faces carry a thin epoxy coating applied to stabilize the olivine and slow oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eCrystal morphology in this slice reflects the pallasite formation environment: olivine grains set in metal, a texture long interpreted as forming near the boundary between a differentiated asteroid's core and mantle. The rounded edges of larger crystals suggest partial resorption in the melt phase before final solidification. Metal-olivine contacts are clean and sharply defined where the polish exposes them.\u003c\/p\u003e\n\u003cp\u003eTerrestrialization progresses from the crystal edges inward, visible as color gradients within individual grains. Some crystals retain translucent amber cores under direct light, surrounded by darker oxidized rims. The metal matrix shows no visible corrosion under the epoxy layer.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003ePallasites have long been interpreted as samples from the core-mantle boundary of a disrupted asteroid, though more recent studies have proposed other origins and the question remains open. Pallasites account for less than 0.2% of all classified meteorites. Sericho was recovered from a strewn field extending over 45 kilometers in Isiolo County, Kenya, with formal recognition following in 2016. \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eThe story\u003c\/h2\u003e\n\u003cp\u003eSericho’s recovery began with lost camels. According to the Meteoritical Bulletin, in 2016 two brothers searching for their animals west of the village of Habaswein, south of Sericho in eastern Kenya, came across several large, unusually dense stones. There are no rocks in that area, so they decided the stones were meteorites, and they spent several weeks moving them home to Habaswein with engine hoists.\u003c\/p\u003e\n\u003cp\u003eThe stones were not new to the people who lived there. The Bulletin records that camel herders had known about the masses for decades, and that one village elder remembered playing on top of them with his brothers when he was a child.\u003c\/p\u003e\n\u003cp\u003eIn early January 2017, Michael Farmer received an email with a photo of a 107 kg “giant pallasite,” travelled to Nairobi and bought it. Two weeks later he returned to Kenya with Moritz Karl and went to Habaswein, where they were shown more than a ton of specimens stacked in the courtyards of two house compounds. The Bulletin records that more than 2,800 kg has been found to date.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSource: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?code=65717\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin entry for Sericho\u003c\/a\u003e, writeup from MB 106.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWhat the research reports\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin classifies Sericho as a pallasite without assigning it to a group. The original classification in Meteoritical Bulletin 106 reported olivine and metal chemistry, including olivine Fa12.3 with an FeO\/MnO ratio of 57.4, but did not include the oxygen isotope or bulk metal trace-element data normally used to place a pallasite in a group. Later peer-reviewed studies have analyzed Sericho as a main group pallasite. Their findings come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. Until the Bulletin entry is updated, this listing uses the official classification.\u003c\/p\u003e\n\u003ch3\u003eWindmill et al. (2022): oxygen isotopes match the main group\u003c\/h3\u003e\n\u003cp\u003eR. J. Windmill, I. A. Franchi, J. L. Hellmann, J. M. Schneider, F. Spitzer, T. Kleine, R. C. Greenwood and M. Anand, of The Open University, the University of Münster, the Max Planck Institute for Solar System Research and the Natural History Museum, London, published \u003ca href=\"https:\/\/doi.org\/10.1093\/pnasnexus\/pgac015\" rel=\"noopener\" target=\"_blank\"\u003eIsotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System\u003c\/a\u003e (PNAS Nexus, volume 1, pgac015, 2022).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOxygen isotopes.\u003c\/strong\u003e Two Sericho olivine samples gave Δ17O values of −0.202 and −0.200 per mil, within the average the authors report for main group pallasite olivine of −0.197 ± 0.016 per mil. The study places Sericho with Seymchan in a low aluminium and manganese subgroup, noting that \"Sericho and Seymchan exhibit variable olivine–metal ratios yet have unresolvable Δ17O values.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFormation.\u003c\/strong\u003e The authors found an oxygen isotope mismatch between olivine and chromite in main group pallasites. They interpret it as evidence that the metal and the olivine came from two different bodies brought together by an impact, rather than forming together at a single core-mantle boundary.\u003c\/p\u003e\n\u003ch3\u003eJung et al. (2026): weathering and magnetism\u003c\/h3\u003e\n\u003cp\u003eJ.-I. Jung, S. Gaal, S. M. Tikoo, E. Lopes, J. Mells, D. H. Burns and R. G. Hatfield, of Stanford University, the University of Alabama and the University of Florida, published \u003ca href=\"https:\/\/doi.org\/10.1111\/maps.70217\" rel=\"noopener\" target=\"_blank\"\u003eMagnetization records of terrestrial weathering in the Sericho pallasite\u003c\/a\u003e (Meteoritics \u0026amp; Planetary Science, 2026).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClassification in the study.\u003c\/strong\u003e The authors describe their sample as \"the main group Sericho pallasite.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFindings.\u003c\/strong\u003e Their sample contained fine magnetite grains inside iron oxide veins, likely goethite, formed by alteration after the meteorite reached Earth. The authors conclude that this secondary material dominates the sample's magnetic signal, so it cannot be used to recover the parent body's magnetic field, and they note that different samples of one meteorite can weather to very different degrees.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Sericho is classified in the Meteoritical Bulletin as a pallasite, with no group assigned. You can verify the classification here: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=65717\" target=\"_blank\"\u003eMeteoritical Bulletin search for Sericho\u003c\/a\u003e. This specimen includes a certificate of authenticity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs Sericho a main group pallasite?\u003c\/strong\u003e The Meteoritical Bulletin classifies Sericho as a pallasite without assigning a group, because the original classification did not include the oxygen isotope or metal trace-element data used to assign one. Later peer-reviewed studies have analyzed Sericho as a main group pallasite, and its olivine oxygen isotope values match the main group. Until the Bulletin entry is updated, this listing uses the official classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e This listing includes the 17.39g slice and a certificate of authenticity. No display stand is included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the olivine brown instead of green?\u003c\/strong\u003e Terrestrialization: oxidation of olivine during surface exposure in Earth's atmosphere. This is a natural process in all recovered pallasites and does not affect scientific value or structural integrity under the protective epoxy coating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this slice be backlit?\u003c\/strong\u003e Olivine in Sericho is typically too oxidized for effective backlighting. The terrestrialized crystals appear opaque to dark brown under transmitted light. Metal content also blocks light transmission. This slice exhibits some translucence and is suitable for a backlighting display.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003ePallasites remain the most visually distinctive meteorite type collectors can acquire, and Sericho offers accessibility to this category due to the large recovered mass and extended strewn field. This 17.39g slice balances size and price point while retaining the diagnostic olivine-metal texture. The high olivine fraction makes Sericho slices denser in crystal coverage than many other pallasites.\u003c\/p\u003e\n\u003cp\u003eCompact slices like this one serve well in organized collections where space constraints matter. The epoxy coating ensures stability over time, addressing the primary long-term preservation concern with pallasite specimens. Browse additional pallasite specimens: \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=65717\" target=\"_blank\"\u003eSericho\u003c\/a\u003e | Classification: Pallasite | Find, Kenya, 2016\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45264942530607,"sku":"SERICHO-17.39G-SLICE-EP","price":140.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/sericho-pallasite-meteorite-17-39g-white-background.jpg?v=1779473057"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-48-14g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 48.14g, Tibet","description":"\u003ch2\u003eA 48.14g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 48.14 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. The slice is long and low, with a raised section along its upper edge, and olivine spread across the whole face. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eOlivine is distributed across the whole face in rounded to angular grains, many of them olive green to amber, with a thin band of weathered exterior along part of the upper margin. The macro photographs show a larger dark olivine crystal and fields of smaller amber grains set in bright metal. The slice is photographed on a stand against a dark background.\u003c\/p\u003e\n\u003cp\u003eThe metal between the crystals has been etched to reveal a fine crosshatched pattern, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate of authenticity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 48.14 grams this slice is sized for a display stand or a cabinet, with olivine across its full length. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45269044494383,"sku":"GYARUB-ZANGBO-48.14G-SLICE-EP","price":865.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-48-14g-backside.jpg?v=1779331028"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-64-0g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 64.00g, Tibet","description":"\u003ch2\u003eA 64.00g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 64.00 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. Olivine is spread evenly across a broad face with a scalloped upper edge, and backlit, many of the crystals glow orange and gold. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eThe slice is wider than it is tall, with an irregular scalloped upper edge. Olivine is scattered fairly evenly across the whole face in rounded to angular grains, with a larger elongated amber and rust coloured crystal near the lower left. The slice is photographed from both sides on a stand, and the edge-on photograph shows its thickness.\u003c\/p\u003e\n\u003cp\u003eThe backlit photograph shows a large number of crystals transmitting orange and gold light.\u003c\/p\u003e\n\u003cp\u003eThe metal between the crystals has been etched to reveal a fine crosshatched pattern, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The macro photographs show the pattern clearly around the crystals. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate card bearing its serial.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 64.00 grams this slice is sized for a display stand, with an even olivine field that reads well from any side. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis specimen carries serial TC-00026 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00026\"\u003eSpecimen Record TC-00026\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45269576777775,"sku":"GYARUB-ZANGBO-64.0G-SLICE-EP","price":1152.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-64-00g-front.jpg?v=1779330122"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-54-18g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 54.18g, Tibet","description":"\u003ch2\u003eA 54.18g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 54.18 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. The slice has a stepped outline with a tall tower on one side, and a broad open field of etched metal across its centre. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eOlivine is concentrated along the lower and side margins and up through the tower, while the centre of the face opens into a wide area of metal with only scattered crystals. Many of the olivine grains are amber to rust brown. The face is photographed on a stand from both sides, and the edge-on photograph shows the thickness of the slice.\u003c\/p\u003e\n\u003cp\u003eThe large open metal area is where this slice stands out. It has been etched, and the macro photographs show an extensive crosshatched pattern across it, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate of authenticity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 54.18 grams this slice combines its olivine with a wide open field of etched metal. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45270144024623,"sku":"GYARUB-ZANGBO-54.18G-SLICE-EP","price":975.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-54-18g-backlit.jpg?v=1777606173"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-45-91g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 45.91g, Tibet","description":"\u003ch2\u003eA 45.91g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 45.91 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. The slice is long and low, with a raised section along its upper edge, and olivine scattered across a bright metal face. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eOlivine is scattered across the whole face in rounded to angular grains, with a band of weathered brown exterior along the upper margin. The macro photographs show several large olivine crystals in clear amber and gold, and the edge-on photograph shows the thickness of the slice. It is photographed on a stand from both sides.\u003c\/p\u003e\n\u003cp\u003eThe metal between the crystals has been etched to reveal a fine crosshatched pattern, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The macro photographs show the pattern clearly between the crystals. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate of authenticity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 45.91 grams this slice is sized for a display stand or a cabinet, with some large clear olivine crystals for its size. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45271296573487,"sku":"GYARUB-ZANGBO-45.91G-SLICE-EP","price":826.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-45.91g-slice-front.jpg?v=1779330060"},{"product_id":"seymchan-pallasite-meteorite-full-slice-pmg-591-00g-widmanstatten-pattern","title":"Seymchan Pallasite Meteorite Full Slice, PMG, 591.00g, Widmanstätten Pattern","description":"\u003ch2\u003e591g full slice from the iron-dominant zone with crisp Widmanstätten banding edge to edge\u003c\/h2\u003e\n\u003cp\u003eThis 591.00g Seymchan full slice is cut from the iron-dominant zone of the mass, presenting no olivine. The Widmanstätten pattern reads across the entire face without interruption. Kamacite bands are sharply delineated throughout, the geometric interlocking structure is consistent from edge to edge, and there is no significant oxidation compromising the etched surface. The specimen is large enough that the crystal geometry registers at a glance rather than requiring close inspection.\u003c\/p\u003e\n\u003ch3\u003eStructure and features\u003c\/h3\u003e\n\u003cp\u003eThe Widmanstätten pattern in this slice formed as the parent body cooled over millions of years deep inside a differentiated asteroid. The process produced an interlocking lattice of kamacite and taenite, two iron-nickel alloys that precipitate at different temperatures and lock into geometric bands as the system slowly equilibrates. The structure cannot be produced artificially and is one of the definitive indicators of iron meteorite authenticity. The banding width visible in this slice is consistent with the iron-dominant zones of Seymchan, which was classified as an iron prior to its reclassification as a pallasite, and the geometry is uninterrupted across the full face.\u003c\/p\u003e\n\u003cp\u003eDue to Seymchan's heterogeneous internal structure, specimens fall into two distinct categories: those from olivine-bearing zones containing silicate crystal clusters, and those from iron-dominant zones consisting almost entirely of nickel-iron metal. This slice is from the iron-dominant zone. Both zone types are scientifically documented within the same classified meteorite.\u003c\/p\u003e\n\u003ch3\u003eScientific context\u003c\/h3\u003e\n\u003cp\u003eSeymchan was found in June 1967 by geologist F. A. Mednikov in the dry bed of the Hekandue river, a left tributary of the Yasachnaya in Magadan Oblast, Russia. The main mass of 272.3 kg was recovered during a geological survey. A second specimen of 51 kg was located nearby in October 1967. Both masses were turned over to the Academy of Sciences of the USSR. The meteorite was first recorded as an iron in Meteoritical Bulletin 43 (1968), later catalogued as IIE and then as an ungrouped iron.\u003c\/p\u003e\n\u003cp\u003eIn 2004, Dmitri Kachalin recovered additional material from the original find area, and approximately 20% of the new specimens were found to contain olivine crystals. This revealed the pallasitic nature of the mass. Van Niekerk et al. formally reclassified Seymchan as a pallasite in 2007. For further reading on pallasite formation and structure, see our guide: \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003eWhat Is a Pallasite?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Seymchan is classified in the Meteoritical Bulletin as Pallasite, PMG. You can verify the classification here: \u003ca rel=\"noopener noreferrer\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=23510\" target=\"_blank\"\u003eSeymchan\u003c\/a\u003e. This specimen ships with a certificate of authenticity from Treasure Coast Meteorite Co. (IMCA #3323).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does PMG mean?\u003c\/strong\u003e PMG stands for pallasite main group, the dominant chemical grouping among pallasites. Seymchan was reclassified as a main group pallasite (Pallasite, PMG) following the identification of olivine-bearing zones in recovered material studied by van Niekerk et al. (2007).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does this slice have no olivine if Seymchan is a pallasite?\u003c\/strong\u003e Seymchan is structurally heterogeneous. Some zones of the mass contain olivine crystal clusters; others consist almost entirely of nickel-iron metal. This slice is cut from an iron-dominant zone. Both zone types are authentic and represent the same classified meteorite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat care does an etched iron meteorite slice require?\u003c\/strong\u003e Store in a low-humidity environment. Periodic application of Renaissance Wax or food-grade mineral oil to the etched face will slow oxidation. Avoid handling with bare hands and keep away from moisture sources.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e The 591.00g Seymchan full slice and a certificate of authenticity with full classification details from Treasure Coast Meteorite Co. (IMCA #3323).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I verify this is the same specimen shown in these photographs?\u003c\/strong\u003e\u003cbr\u003eThis stone is recorded under serial \u003cstrong\u003eTC-00020\u003c\/strong\u003e. Its \u003ca href=\"\/pages\/specimen-record-tc-00020\"\u003especimen record\u003c\/a\u003e is a permanent page holding the classification data as published in the Meteoritical Bulletin, the recorded weight, and photographs of this exact stone. Meteorite surfaces, cut faces and clast patterns are individual to each stone, so a specimen in hand can be compared against those photographs and weighed against the recorded figure.\u003c\/p\u003e\n\u003ch3\u003eCollector significance\u003c\/h3\u003e\n\u003cp\u003eFull slices of Seymchan at this size are not commonly available. Most material on the collector market comes as smaller partial slices, end cuts, or fragments. At 591g and over 20 cm in length, this specimen represents a substantial section of the mass. The full-slice format is what best displays Widmanstätten structure at scale, and in this specimen the geometry is uninterrupted from edge to edge with no significant oxidation or surface compromise. The iron-dominant zone is the material that most clearly expresses the structural identity recorded when Seymchan was classified as an iron, and that structure is the primary visual feature of this slice.\u003c\/p\u003e\n\u003cp\u003eSeymchan occupies a specific position in the collector market as a pallasite with two visually distinct specimen types from the same classified mass. Collectors working across meteorite categories often target both. This slice represents the iron-dominant type in a format and at a size that is increasingly difficult to source as original stock is cut down and dispersed.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener noreferrer\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=23510\" target=\"_blank\"\u003eSeymchan\u003c\/a\u003e | Classification: Pallasite, PMG | Find, Russia, 1967\u003c\/p\u003e\n\u003ch3\u003eSpecimen record\u003c\/h3\u003e\n\u003cp\u003eThis specimen is serialized as \u003cstrong\u003eTC-00020\u003c\/strong\u003e and is issued with a certificate card bearing that serial. The serial indexes a permanent public record maintained by Treasure Coast Meteorite Co., and every issued serial is listed in the \u003ca href=\"\/pages\/specimen-registry\"\u003eSpecimen Registry\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat the research reports\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin classifies Seymchan as a main group pallasite (Pallasite, PMG). The entry records how that classification changed over time: Iron in Meteoritical Bulletin 43 (1968), IIE in the Natural History Museum Catalogue of Meteorites (2000), and Iron-ung in MetBase (2006), before the reclassification that followed van Niekerk et al. (2007). The Bulletin lists the total known weight as 323.3 kg, while the original 1968 writeup gave about 351 kg for the first two masses. The findings below come from the authors’ own samples and methods, not from the Bulletin, and are given here as the studies state them.\u003c\/p\u003e\n\u003ch3\u003evan Niekerk et al. (2007): from iron to pallasite\u003c\/h3\u003e\n\u003cp\u003eD. van Niekerk, R. C. Greenwood, I. A. Franchi, E. R. D. Scott and K. Keil, of the University of Hawaii and The Open University, presented \u003ca href=\"https:\/\/www.lpi.usra.edu\/meetings\/metsoc2007\/pdf\/5196.pdf\" rel=\"noopener\" target=\"_blank\"\u003eSeymchan: A main group pallasite, not an iron meteorite\u003c\/a\u003e at the 70th Annual Meteoritical Society Meeting (abstract 5196, 2007).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSame meteorite.\u003c\/strong\u003e A 2004 expedition to the original site recovered more masses, and reports suggested about a fifth of them were pallasitic. Neutron activation analysis showed the pallasite metal is identical in composition to the original iron masses, confirming that they belong to the same meteorite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClassification.\u003c\/strong\u003e Oxygen isotopes in the olivine fall within the main group field, and the metal composition groups Seymchan with the main group. The authors add that its high iridium “indicates that it is anomalous (PMG-am),” a finer distinction than the Bulletin’s PMG classification records.\u003c\/p\u003e\n\u003ch3\u003eWindmill et al. (2022): oxygen isotopes\u003c\/h3\u003e\n\u003cp\u003eThe PNAS Nexus study \u003ca href=\"https:\/\/doi.org\/10.1093\/pnasnexus\/pgac015\" rel=\"noopener\" target=\"_blank\"\u003eIsotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System\u003c\/a\u003e, by R. J. Windmill and colleagues at The Open University, the University of Münster, the Max Planck Institute for Solar System Research and the Natural History Museum, London, places Seymchan in a low aluminium and manganese subgroup of the main group pallasites. It notes that Seymchan and Sericho have oxygen isotope values that cannot be told apart despite their different olivine to metal ratios, and it interprets main group pallasites as mixtures of olivine and metal from two different bodies brought together by an impact.\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45340333637679,"sku":"SEYMCHAN-591.00G-SLICE","price":2500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/seymchan-pallasite-591g-full-slice-widmanstatten-01.jpg?v=1779329566"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-86-11g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 86.11g, Tibet","description":"\u003ch2\u003eAn 86.11g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is an 86.11 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. Backlit, gold and amber olivine lights up across the slice around a distinctive open area of metal. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eThe slice has a rounded shield outline. Olivine is dense across most of the face, with a more open, metal-rich area near the centre that shows as a pale patch in the backlit photographs. Grains run from small rounded crystals to larger angular ones in yellow-green, amber and brown.\u003c\/p\u003e\n\u003cp\u003eThe backlit photographs show a large share of the crystals transmitting gold and amber light, while more weathered grains stay dark.\u003c\/p\u003e\n\u003cp\u003eThe metal between the crystals has been etched to reveal a fine crosshatched pattern, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The macro photographs show the pattern in the open metal areas. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate card bearing its serial.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 86.11 grams this slice is sized for a display stand, where the open metal area and the backlit olivine both read clearly. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis specimen carries serial TC-00032 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00032\"\u003eSpecimen Record TC-00032\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45383091748911,"sku":"GYARUB-ZANGBO-86-11G-SLICE-EP","price":1550.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-86.11g-white-background.jpg?v=1779551770"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-74-92g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 74.92g, Tibet","description":"\u003ch2\u003eA 74.92g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 74.92 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. Olivine is packed densely across the whole face, and backlit against the sky a large share of the crystals glow gold and amber. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eThe slice is taller than it is wide, with a notched upper edge. Olivine is dense and fairly even across the entire face, with many crystals in bright amber and gold alongside darker weathered grains. Both faces are photographed on a stand, and the olivine pattern differs between them.\u003c\/p\u003e\n\u003cp\u003eThe macro photographs show elongated and angular olivine crystals, including a long amber grain that transmits light strongly.\u003c\/p\u003e\n\u003cp\u003eThe metal between the crystals has been etched to reveal a fine crosshatched pattern, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The macro photographs show the pattern in the metal between the crystals. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate card bearing its serial.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 74.92 grams this slice is sized for a display stand, and its density of translucent olivine makes it especially strong against a light. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis specimen carries serial TC-00008 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00008\"\u003eSpecimen Record TC-00008\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45383174160431,"sku":"GYARUB-ZANGBO-74.92G-SLICE-EP","price":1350.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-74.92g-white-background.jpg?v=1779554352"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-76-62g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 76.62g, Tibet","description":"\u003ch2\u003eA 76.62g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 76.62 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. The slice has a tall peaked outline, with open etched metal near the top and dense amber olivine through the lower half. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eOlivine is concentrated through the lower half of the face, while the upper part near the peak opens into broad areas of metal with fewer crystals. A thin weathering vein crosses part of the face. The macro photographs pick out several large fractured olivine crystals, one with a small inclusion near its centre, that glow amber and gold under light.\u003c\/p\u003e\n\u003cp\u003eThe backlit photographs, taken against the sky, show which crystals still transmit light and which have weathered dark.\u003c\/p\u003e\n\u003cp\u003eThe metal between the crystals has been etched to reveal a fine crosshatched pattern, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The macro photographs show the pattern across the open metal near the top of the slice. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate card bearing its serial.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 76.62 grams this slice combines a distinctive peaked silhouette with large, strongly translucent olivine crystals. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis specimen carries serial TC-00025 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00025\"\u003eSpecimen Record TC-00025\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45383409664047,"sku":"GYARUB-ZANGBO-76.62G-SLICE-EP","price":1379.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-76.62g-white-background.jpg?v=1779562451"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-226-95g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 226.95g, Tibet","description":"\u003ch2\u003eA 226.95g slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 226.95 gram polished slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. Broad fields of olivine sit in a polished iron-nickel matrix, and where the crystals stay translucent they light up in amber and gold under strong light. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eOlivine is scattered densely across both faces, from small grains to larger angular crystals, with a few more open patches of metal breaking up the field. The in-hand photographs show both faces, and the olivine distribution differs between them, as expected for a slice cut through a coarse aggregate.\u003c\/p\u003e\n\u003cp\u003eThe backlit macro photographs show individual crystals glowing gold and orange, with the fracture network inside each grain picked out by the light. Weathered grains stay dark brown to near black. The edge-on photograph shows the thickness of the slice.\u003c\/p\u003e\n\u003cp\u003eThe metal is polished to a smooth, bright finish between the crystals, and the Bulletin records it as kamacite and taenite. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The polished 226.95g slice shown, on an acrylic display stand, with a Treasure Coast Meteorite Co. certificate card bearing its serial.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 226.95 grams this is a centerpiece slice rather than a study piece, with enough surface for the olivine field to read from across a room. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis specimen carries serial TC-00016 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00016\"\u003eSpecimen Record TC-00016\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45620157874223,"sku":"GYARUB-ZANGBO-226.95G-SLICE-EP","price":4085.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-226.95g-01-front-face-display-stand.jpg?v=1784149431"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-301-28g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 301.28g, Tibet","description":"\u003ch2\u003eA 301.28g slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 301.28 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. Olivine sits in clustered fields across a bright iron-nickel matrix that has been etched to reveal the crystal structure of the metal. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eThe polished faces carry olivine in irregular clusters rather than an even scatter, with the largest groups running to several centimetres across and isolated grains elsewhere in the field. Where the crystals remain translucent they transmit amber and honey tones under strong light; weathered grains stay deep brown to near black. Both faces are photographed here, and the olivine distribution differs between them, which is what you would expect from a slice cut through a coarse aggregate.\u003c\/p\u003e\n\u003cp\u003eThe metal takes a fine crosshatched etch pattern across both faces, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs white glove delivery available?\u003c\/strong\u003e Yes. As a premium specimen, this slice qualifies for our \u003ca href=\"\/pages\/white-glove-service\"\u003ewhite glove service\u003c\/a\u003e, a fully insured, personal delivery made directly to you at approved destinations. It is arranged on request before fulfillment, so contact us with your delivery location.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 301.28 grams this is a display slice rather than a study piece, large enough to carry both faces of a coarse pallasite structure with room for the olivine clusters to read at a distance. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis slice is part of our \u003ca href=\"\/collections\/premium-specimens\"\u003epremium specimens\u003c\/a\u003e and qualifies for our \u003ca href=\"\/pages\/white-glove-service\"\u003ewhite glove service\u003c\/a\u003e: fully insured, personal delivery directly into your hands at approved domestic and international destinations, arranged on request.\u003c\/p\u003e\n\n\u003cp\u003eThis specimen carries serial TC-00035 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00035\"\u003eSpecimen Record TC-00035\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45861339103279,"sku":"GYARUB-ZANGBO-301.28G-SLICE-EP","price":5423.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-301.28g-polished-face.jpg?v=1787453951"},{"product_id":"seymchan-pallasite-full-slice-pmg-308-40g-translucent-olivine","title":"Seymchan Pallasite Full Slice, PMG, 308.40g, Translucent Olivine","description":"\u003ch2\u003eAbout this specimen\u003c\/h2\u003e\n\u003cp\u003eThis is a 308.40 g full slice of Seymchan, a pallasite recovered from the Magadan region of Russia. It is a complete cross section of the mass rather than a part slice cut from one. The Meteoritical Bulletin Database records the recommended classification as Pallasite, PMG, the find year as 1967, and the country as Russia. It is recorded as a find rather than an observed fall.\u003c\/p\u003e\n\u003cp\u003eSeymchan is one of a small number of meteorites whose classification was formally overturned after decades on the books. It entered the literature in 1968 as an iron. It is on the books today as a main group pallasite. The material on this cut face is the reason why.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eOlivine occupies a large proportion of the cut face, set in an iron nickel matrix. Under transmitted light a substantial share of those crystals pass light cleanly, running from pale gold through honey and amber into deep orange, with internal fracture planes and cleavage steps visible inside the better ones.\u003c\/p\u003e\n\u003cp\u003eThat transparency is the variable that separates one pallasite slice from another. Olivine in pallasites is often opaque, heavily fractured, or clouded by terrestrial weathering, and the proportion of light passing crystals differs from mass to mass and from cut to cut within a single mass. On this slice the light passing fraction is high enough that the specimen reads as an entirely different object backlit than it does in reflected light. The photographs above show it both ways.\u003c\/p\u003e\n\u003cp\u003eCrystal outlines across most of the face are angular rather than rounded, and metal veins separate the denser olivine clusters. Both faces are complete, with the natural exterior margin of the mass running the full way around.\u003c\/p\u003e\n\u003cp\u003eThe metal is mirror polished and has not been acid etched, which is a deliberate choice on a slice cut for its olivine. Etching develops the \u003ca href=\"\/pages\/widmanstatten-pattern-explained\"\u003eWidmanstatten pattern\u003c\/a\u003e in the metal, but it does so by leaving the surface matte and grey. A mirror polish keeps the matrix bright and reflective, which is what a face like this one needs: light entering the olivine has a reflective surround behind and between the crystals rather than a dulled one. Buyers who want the etched structure should look to an iron rather than to this slice.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a light epoxy coating applied as a moisture barrier. It is thin, it does not obscure the olivine or the metal, and it is ordinary practice for iron bearing meteorites intended for open display. Handling and storage guidance is set out in \u003ca href=\"\/pages\/how-to-care-for-and-store-a-meteorite\"\u003ehow to care for and store a meteorite\u003c\/a\u003e, and the underlying issue is covered in \u003ca href=\"\/pages\/do-meteorites-rust\"\u003edo meteorites rust\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin writeup, published as Meteoritical Bulletin no. 43 in Moscow in 1968 and reprinted in Meteoritics 5, 85 to 109 in 1970, records the discovery in detail. The meteorite was found in a brook bed flowing into the river Hekandue, a left tributary of the river Jasachnaja, in the Magadan district. Two individual specimens were recovered. The larger was found in June 1967 by the geologist F. A. Mednikov during a geological survey, lying among the stones of the brook bed. The smaller was found at a distance of 20 m from the first by I. H. Markov with a mine detector in October 1967. The writeup records that the main mass was turned over to the Academy of Sciences of the USSR.\u003c\/p\u003e\n\u003cp\u003eRecorded coordinates are 62 degrees 54 minutes N, 152 degrees 26 minutes E. Seymchan is one of 6 approved meteorites from Magadanskaya oblast, Russia.\u003c\/p\u003e\n\u003cp\u003eThis specimen was acquired by Treasure Coast Meteorite Co. and cut and prepared for sale. It carries serial TC-00039 and a permanent specimen record page.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe classification history in the Bulletin database reads as a sequence. Meteoritical Bulletin 43 in 1968 recorded it as Iron. The NHM Catalogue 5th Edition in 2000 recorded it as IIE. MetBase version 7.1 in 2006 recorded it as Iron ungrouped. The recommended classification is Pallasite, PMG. The database comments field records the reclassification against van Niekerk et al. (2007), with a revision dated 26 May 2009 covering revised pallasite classifications.\u003c\/p\u003e\n\u003cp\u003eThe 2007 abstract behind that change, \u003ca href=\"https:\/\/www.lpi.usra.edu\/meetings\/metsoc2007\/pdf\/5196.pdf\" rel=\"noopener\" target=\"_blank\"\u003eSeymchan: A Main Group Pallasite, Not an Iron Meteorite\u003c\/a\u003e, presented at the 70th Annual Meteoritical Society Meeting, sets out the reasoning. A 2004 expedition to the same locality recovered further masses. The abstract notes reports that roughly 20 percent of those newer finds were pallasitic or partly pallasitic, with the remainder iron. Oxygen isotope analysis of the silicate placed the material inside the main group pallasite field, and the metal composition matched the original iron masses. A meteorite described for forty years from metal alone turned out to be heterogeneous, and the pallasitic portion had simply not been sampled first.\u003c\/p\u003e\n\u003cp\u003ePallasites have long been interpreted as material from the boundary region between the metallic core and the silicate mantle of a differentiated asteroid, though the formation setting remains under active debate in the literature. Background on the class is set out in \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat is a pallasite\u003c\/a\u003e, and the way classifications like this one are assigned and revised is covered in \u003ca href=\"\/pages\/how-are-meteorites-classified\"\u003ehow are meteorites classified\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eSeymchan is one of 79 approved meteorites classified as Pallasite, PMG, as recorded in the Meteoritical Bulletin Database in September 2026.\u003c\/p\u003e\n\u003ch2\u003eWhat the research reports\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin classifies Seymchan as a main group pallasite (Pallasite, PMG). The entry records how that classification changed over time: Iron in Meteoritical Bulletin 43 (1968), IIE in the Natural History Museum Catalogue of Meteorites (2000), and Iron-ung in MetBase (2006), before the reclassification that followed van Niekerk et al. (2007). The Bulletin lists the total known weight as 323.3 kg, while the original 1968 writeup gave about 351 kg for the first two masses. The findings below come from the authors’ own samples and methods, not from the Bulletin, and are given here as the studies state them.\u003c\/p\u003e\n\u003ch3\u003evan Niekerk et al. (2007): from iron to pallasite\u003c\/h3\u003e\n\u003cp\u003eD. van Niekerk, R. C. Greenwood, I. A. Franchi, E. R. D. Scott and K. Keil, of the University of Hawaii and The Open University, presented \u003ca href=\"https:\/\/www.lpi.usra.edu\/meetings\/metsoc2007\/pdf\/5196.pdf\" rel=\"noopener\" target=\"_blank\"\u003eSeymchan: A main group pallasite, not an iron meteorite\u003c\/a\u003e at the 70th Annual Meteoritical Society Meeting (abstract 5196, 2007).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSame meteorite.\u003c\/strong\u003e A 2004 expedition to the original site recovered more masses, and reports suggested about a fifth of them were pallasitic. Neutron activation analysis showed the pallasite metal is identical in composition to the original iron masses, confirming that they belong to the same meteorite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClassification.\u003c\/strong\u003e Oxygen isotopes in the olivine fall within the main group field, and the metal composition groups Seymchan with the main group. The authors add that its high iridium “indicates that it is anomalous (PMG-am),” a finer distinction than the Bulletin’s PMG classification records.\u003c\/p\u003e\n\u003ch3\u003eWindmill et al. (2022): oxygen isotopes\u003c\/h3\u003e\n\u003cp\u003eThe PNAS Nexus study \u003ca href=\"https:\/\/doi.org\/10.1093\/pnasnexus\/pgac015\" rel=\"noopener\" target=\"_blank\"\u003eIsotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System\u003c\/a\u003e, by R. J. Windmill and colleagues at The Open University, the University of Münster, the Max Planck Institute for Solar System Research and the Natural History Museum, London, places Seymchan in a low aluminium and manganese subgroup of the main group pallasites. It notes that Seymchan and Sericho have oxygen isotope values that cannot be told apart despite their different olivine to metal ratios, and it interprets main group pallasites as mixtures of olivine and metal from two different bodies brought together by an impact.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhy was Seymchan reclassified from an iron meteorite to a pallasite?\u003c\/strong\u003e\u003cbr\u003eBecause the first two masses recovered in 1967 were metal. A 2004 expedition to the same locality recovered further masses, some of them olivine bearing. Oxygen isotope work on that silicate placed it in the main group pallasite field while the metal chemistry matched the original irons, establishing that the meteorite is heterogeneous rather than that two meteorites had been confused. The Bulletin database records the reclassification against van Niekerk et al. (2007).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the olivine on this slice actually translucent?\u003c\/strong\u003e\u003cbr\u003eYes, across a large share of the face. The backlit photographs above are of this specific slice and are not stock images. Not every crystal transmits, and the darker crystals stay dark, which is normal for the material.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this slice show a Widmanstatten pattern?\u003c\/strong\u003e\u003cbr\u003eNo. The faces are mirror polished and have not been acid etched, so the metal reads as a bright reflective matrix rather than a patterned one. This is stated plainly because it is a preparation choice rather than an oversight. Etching would develop the pattern at the cost of a matte grey surround for the olivine, and on a slice whose value sits in the transparency of its crystals that is the wrong trade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the epoxy coating for?\u003c\/strong\u003e\u003cbr\u003eIt is a thin moisture barrier. Iron bearing meteorites take up atmospheric moisture and can corrode over time without protection. The coating is light enough that it does not change the appearance of the olivine or the metal, and it is disclosed here rather than left to be discovered.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWas Seymchan seen to fall?\u003c\/strong\u003e\u003cbr\u003eNo. The Bulletin database records it as a find, with a find year of 1967.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat documentation comes with it?\u003c\/strong\u003e\u003cbr\u003eA certificate card bearing serial TC-00039, and a permanent specimen record page on this site giving the identification and classification data, the recorded weight, and photographs of this specimen. The serial is an index to that record.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eSeymchan is available material, and small slices of it are not difficult to find. Large slices carrying a high proportion of light passing olivine are a narrower proposition, because the olivine content varies across the meteorite and the transparency of that olivine varies again on top of it. At 308.40 g this sits well above the size at which pallasite material is usually offered, and the backlit face is the reason to want it rather than an incidental feature of it.\u003c\/p\u003e\n\u003cp\u003eIt is also a full slice. Most pallasite on the market is part slice material cut from the interior of a mass, which shows the olivine but not the shape of the stone it came from. A complete cross section carries the natural margin the whole way around and can be read as a section through a specific object rather than as a sample of a meteorite. Full slices at this weight are a much smaller pool than part slices at the same weight.\u003c\/p\u003e\n\u003cp\u003eIt also carries an unusually legible piece of scientific history. Reclassifications of this kind are infrequent, and the paper trail is public, dated, and citable rather than anecdotal. A buyer can follow the classification from Iron in 1968 to Pallasite, PMG today through the database record itself.\u003c\/p\u003e\n\u003cp\u003eOffered by Treasure Coast Meteorite Co., IMCA Member #3323, Hobe Sound, Florida. Further pallasite and iron material is listed in the \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003estony iron meteorite collection\u003c\/a\u003e. Classification data on this page is reproduced from the \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=23510\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin Database entry for Seymchan\u003c\/a\u003e, maintained by the Nomenclature Committee of the \u003ca href=\"https:\/\/meteoritical.org\/\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Society\u003c\/a\u003e and hosted by the \u003ca href=\"https:\/\/www.lpi.usra.edu\/\" rel=\"noopener\" target=\"_blank\"\u003eLunar and Planetary Institute\u003c\/a\u003e. How that database works and what its entries record is explained in \u003ca href=\"\/pages\/meteoritical-bulletin-explained\"\u003eunderstanding the Meteoritical Bulletin\u003c\/a\u003e.\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":46122648862767,"sku":"SEYMCHAN-308.40G-SLICE-EP","price":4780.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/seymchan-pallasite-pmg-308.40g-full-slice-backlit-2.jpg?v=1788825663"},{"product_id":"seymchan-pallasite-full-slice-pmg-286-28g-translucent-olivine","title":"Seymchan Pallasite Full Slice, PMG, 286.28g, Translucent Olivine","description":"\u003ch2\u003eAbout this specimen\u003c\/h2\u003e\n\u003cp\u003eThis is a 286.28 g full slice of Seymchan, a pallasite from the Magadan region of Russia. The Meteoritical Bulletin Database records the recommended classification as Pallasite, PMG, the find year as 1967, and the country as Russia. It is recorded as a find rather than an observed fall.\u003c\/p\u003e\n\u003cp\u003eThe meteorite spent four decades on the books as an iron. It was reclassified in 2007 after olivine bearing material turned up at the same locality, and the cut face on this slice is the material that forced the change.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eOlivine covers the face densely and reaches the margins on every side, so there is no quiet zone of bare metal at the edges. Under transmitted light the crystal field lights up across the whole width of the slice, from pale straw and lemon through honey into deep orange and occasional near red, with a scatter of darker crystals holding the pattern together.\u003c\/p\u003e\n\u003cp\u003eTransmission is the variable that separates one pallasite slice from another. Olivine in pallasites is often clouded, fractured or simply opaque, and how much of it passes light differs from mass to mass and from cut to cut within a single mass. On this slice the light passing fraction is high enough that the specimen changes character completely depending on whether it is lit from in front or behind. The photographs above show it both ways so the difference can be judged before buying rather than after.\u003c\/p\u003e\n\u003cp\u003eCrystal outlines are angular and the individual crystals here run smaller and more numerous than on a coarse pallasite cut, which is what produces the dense scatter across the face. Metal separates the clusters as veins and pockets rather than as broad open areas.\u003c\/p\u003e\n\u003cp\u003eThe metal is mirror polished and has not been acid etched. Etching develops the \u003ca href=\"\/pages\/widmanstatten-pattern-explained\"\u003eWidmanstatten pattern\u003c\/a\u003e in the metal at the cost of leaving the surface matte and grey. A mirror finish keeps the matrix bright, which is what a face carrying this much olivine wants behind and between the crystals. Anyone after the etched structure should be looking at an iron rather than at this slice.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a light epoxy coating applied as a moisture barrier. It is thin, it does not obscure the olivine or dull the metal, and it is ordinary practice for iron bearing meteorites meant for open display. Handling and storage guidance is set out in \u003ca href=\"\/pages\/how-to-care-for-and-store-a-meteorite\"\u003ehow to care for and store a meteorite\u003c\/a\u003e, and the underlying issue is covered in \u003ca href=\"\/pages\/do-meteorites-rust\"\u003edo meteorites rust\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin writeup, published as Meteoritical Bulletin no. 43 in Moscow in 1968 and reprinted in Meteoritics 5, 85 to 109 in 1970, records the circumstances. The meteorite was found in a brook bed flowing into the river Hekandue, a left tributary of the river Jasachnaja, in the Magadan district. Two individual specimens were recovered. The larger was found in June 1967 by the geologist F. A. Mednikov during a geological survey, lying among the stones of the brook bed. The smaller was found at a distance of 20 m from the first by I. H. Markov with a mine detector in October 1967. The writeup records that the main mass was turned over to the Academy of Sciences of the USSR.\u003c\/p\u003e\n\u003cp\u003eRecorded coordinates are 62 degrees 54 minutes N, 152 degrees 26 minutes E. Seymchan is one of 6 approved meteorites from Magadanskaya oblast, Russia.\u003c\/p\u003e\n\u003cp\u003eThis specimen was acquired by Treasure Coast Meteorite Co. and prepared as a full slice, mirror polished on both faces and given a light epoxy coating as a moisture barrier. It carries serial TC-00041 and a permanent specimen record page.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe classification history in the Bulletin database runs as a sequence of corrections. Meteoritical Bulletin 43 in 1968 recorded Seymchan as Iron. The NHM Catalogue 5th Edition in 2000 recorded it as IIE. MetBase version 7.1 in 2006 recorded it as Iron ungrouped. The recommended classification today is Pallasite, PMG. The database comments field records the reclassification against van Niekerk et al. (2007), with a revision dated 26 May 2009 covering revised pallasite classifications.\u003c\/p\u003e\n\u003cp\u003eThe 2007 abstract behind the change, \u003ca href=\"https:\/\/www.lpi.usra.edu\/meetings\/metsoc2007\/pdf\/5196.pdf\" rel=\"noopener\" target=\"_blank\"\u003eSeymchan: A Main Group Pallasite, Not an Iron Meteorite\u003c\/a\u003e, presented at the 70th Annual Meteoritical Society Meeting, sets out the evidence. A 2004 expedition to the locality recovered further masses, and the abstract notes reports that roughly 20 percent of those newer finds were pallasitic or partly pallasitic while the remainder were iron. Oxygen isotope analysis of the silicate placed it inside the main group pallasite field, and the metal composition matched the original iron masses. The meteorite had always been heterogeneous. The first people to study it simply had metal in front of them.\u003c\/p\u003e\n\u003cp\u003ePallasites have long been read as material from the boundary region between the metallic core and the silicate mantle of a differentiated asteroid, though the setting in which they formed remains under active debate. Background on the class is set out in \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat is a pallasite\u003c\/a\u003e, and the way classifications are assigned and revised is covered in \u003ca href=\"\/pages\/how-are-meteorites-classified\"\u003ehow are meteorites classified\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eSeymchan is one of 79 approved meteorites classified as Pallasite, PMG, as recorded in the Meteoritical Bulletin Database in September 2026.\u003c\/p\u003e\n\u003ch2\u003eWhat the research reports\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin classifies Seymchan as a main group pallasite (Pallasite, PMG). The entry records how that classification changed over time: Iron in Meteoritical Bulletin 43 (1968), IIE in the Natural History Museum Catalogue of Meteorites (2000), and Iron-ung in MetBase (2006), before the reclassification that followed van Niekerk et al. (2007). The Bulletin lists the total known weight as 323.3 kg, while the original 1968 writeup gave about 351 kg for the first two masses. The findings below come from the authors’ own samples and methods, not from the Bulletin, and are given here as the studies state them.\u003c\/p\u003e\n\u003ch3\u003evan Niekerk et al. (2007): from iron to pallasite\u003c\/h3\u003e\n\u003cp\u003eD. van Niekerk, R. C. Greenwood, I. A. Franchi, E. R. D. Scott and K. Keil, of the University of Hawaii and The Open University, presented \u003ca href=\"https:\/\/www.lpi.usra.edu\/meetings\/metsoc2007\/pdf\/5196.pdf\" rel=\"noopener\" target=\"_blank\"\u003eSeymchan: A main group pallasite, not an iron meteorite\u003c\/a\u003e at the 70th Annual Meteoritical Society Meeting (abstract 5196, 2007).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSame meteorite.\u003c\/strong\u003e A 2004 expedition to the original site recovered more masses, and reports suggested about a fifth of them were pallasitic. Neutron activation analysis showed the pallasite metal is identical in composition to the original iron masses, confirming that they belong to the same meteorite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClassification.\u003c\/strong\u003e Oxygen isotopes in the olivine fall within the main group field, and the metal composition groups Seymchan with the main group. The authors add that its high iridium “indicates that it is anomalous (PMG-am),” a finer distinction than the Bulletin’s PMG classification records.\u003c\/p\u003e\n\u003ch3\u003eWindmill et al. (2022): oxygen isotopes\u003c\/h3\u003e\n\u003cp\u003eThe PNAS Nexus study \u003ca href=\"https:\/\/doi.org\/10.1093\/pnasnexus\/pgac015\" rel=\"noopener\" target=\"_blank\"\u003eIsotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System\u003c\/a\u003e, by R. J. Windmill and colleagues at The Open University, the University of Münster, the Max Planck Institute for Solar System Research and the Natural History Museum, London, places Seymchan in a low aluminium and manganese subgroup of the main group pallasites. It notes that Seymchan and Sericho have oxygen isotope values that cannot be told apart despite their different olivine to metal ratios, and it interprets main group pallasites as mixtures of olivine and metal from two different bodies brought together by an impact.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhy was Seymchan reclassified from an iron to a pallasite?\u003c\/strong\u003e\u003cbr\u003eThe two masses recovered in 1967 were metal, and the meteorite was described from them. A 2004 expedition to the same locality recovered further masses, some carrying olivine. Oxygen isotope work on that silicate placed it in the main group pallasite field while the metal chemistry matched the original irons, which established that one heterogeneous meteorite was involved rather than two separate ones. The Bulletin database records the reclassification against van Niekerk et al. (2007).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much of the olivine actually passes light?\u003c\/strong\u003e\u003cbr\u003eA large share of it, across the full width of the face. The backlit photographs above are of this specific slice and are not stock images. Some crystals stay dark and the darker ones do not transmit at all, which is normal for the material and visible in the images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this slice show a Widmanstatten pattern?\u003c\/strong\u003e\u003cbr\u003eNo. The faces are mirror polished rather than acid etched, so the metal reads as a bright reflective matrix instead of a patterned one. This is a preparation decision rather than an omission. Etching would develop the pattern but would leave a matte grey surround for the olivine, which is the wrong trade on a slice whose value is in the transparency of its crystals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the epoxy coating for?\u003c\/strong\u003e\u003cbr\u003eIt is a thin moisture barrier. Iron bearing meteorites take up atmospheric moisture and can corrode over time without protection. The coating is light enough that it does not change the appearance of the olivine or the metal, and it is disclosed here rather than left to be found later.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWas Seymchan seen to fall?\u003c\/strong\u003e\u003cbr\u003eNo. The Bulletin database records it as a find, with a find year of 1967.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat documentation comes with it?\u003c\/strong\u003e\u003cbr\u003eA certificate card bearing serial TC-00041, and a permanent specimen record page on this site giving the identification and classification data, the recorded weight, and photographs of this specimen. The serial is an index to that record.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eSeymchan is available material and small slices of it are not difficult to find. Large slices carrying a high proportion of light passing olivine are a much narrower proposition, because olivine content varies across the meteorite and the transparency of that olivine varies again on top of it. At 286.28 g this sits well above the size at which pallasite material is usually offered, and the backlit face is the reason to want it rather than a bonus feature of it.\u003c\/p\u003e\n\u003cp\u003eIt is also a full slice. Most pallasite on the market is part slice material cut from the interior of a mass, which shows the olivine but not the shape of the stone that carried it. A complete cross section keeps the natural margin the whole way around and reads as a section through a specific object rather than a sample taken from one. Full slices at this weight are a far smaller pool than part slices at the same weight, and they are not directly comparable on price per gram.\u003c\/p\u003e\n\u003cp\u003eThe meteorite also carries an unusually legible piece of scientific history. Reclassifications of this kind are infrequent, and this one is documented, dated and citable rather than anecdotal. The path from Iron in 1968 to Pallasite, PMG today can be followed through the database record itself.\u003c\/p\u003e\n\u003cp\u003eOffered by Treasure Coast Meteorite Co., IMCA Member #3323, Hobe Sound, Florida. Further pallasite and iron material is listed in the \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003estony iron meteorite collection\u003c\/a\u003e. Classification data on this page is reproduced from the \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=23510\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin Database entry for Seymchan\u003c\/a\u003e, maintained by the Nomenclature Committee of the \u003ca href=\"https:\/\/meteoritical.org\/\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Society\u003c\/a\u003e and hosted by the \u003ca href=\"https:\/\/www.lpi.usra.edu\/\" rel=\"noopener\" target=\"_blank\"\u003eLunar and Planetary Institute\u003c\/a\u003e. How that database works and what its entries record is explained in \u003ca href=\"\/pages\/meteoritical-bulletin-explained\"\u003eunderstanding the Meteoritical Bulletin\u003c\/a\u003e.\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":46143494946863,"sku":"SEYMCHAN-286.28G-SLICE-EP","price":4437.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/seymchan-pallasite-pmg-286.28g-full-slice-backlit.jpg?v=1788842267"},{"product_id":"sericho-pallasite-meteorite-full-slice-103-50g-polished-and-etched","title":"Sericho Pallasite Meteorite Full Slice, 103.50g, Polished and Etched","description":"\u003cp\u003eA complete cross section through a Kenyan pallasite, cut from a single stone and finished on both faces. This 103.50 g full slice carries olivine grains distributed through an iron-nickel matrix that has been polished, etched, and sealed with an epoxy coating. The slice is uninterrupted from edge to edge, so the metal and silicate relationship can be read across the whole width of the stone rather than in a fragment of it.\u003c\/p\u003e\n\n\u003cp\u003eSericho was recovered from a strewnfield in Isiolo County, Kenya, and classified as a pallasite by L. Garvie, A. Wittmann, and D. Schrader at Arizona State University. The Meteoritical Bulletin records the find year as 2016 and lists the classification in Bulletin 106. As of September 2026, the Meteoritical Bulletin lists this as 1 of 99 approved meteorites classified as Pallasite.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\n\u003cp\u003eThe Bulletin describes Sericho slices as averaging near 70 areal percent olivine, with grains typically 0.5 to 1 cm across and a small number reaching up to 4 cm. Grains are largely rounded and less commonly euhedral, and the published description records them as gemmy green to orange. Both colors are present on this slice, and the transmitted light photograph shows how far light travels through the thinner grains.\u003c\/p\u003e\n\n\u003cp\u003eThe metal is dominated by swathing kamacite around the olivine, with pockets of dark-etching plessite. Etching brings out that structure as tonal contrast across the matrix rather than as a single uniform figure. The Bulletin notes that a well developed Widmanstatten pattern appears only in the occasional metal-rich region of Sericho, so this is a slice to read for its metal and silicate architecture rather than for a classic crossed-band figure.\u003c\/p\u003e\n\n\u003cp\u003eAccessory troilite and schreibersite are recorded in the classification, along with under 1 areal percent chromite. Weathering grade is stated as low, which is consistent with the surface recoveries described in the Bulletin writeup.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\n\u003cp\u003eThe published history records that in 2016 two brothers searching for their camels came across several large dense stones west of Habaswein and south of Sericho. There are no rocks in that area, so they concluded the masses were meteorites and spent several weeks recovering them with engine hoists. The stones had been known to camel herders for decades before that. One village elder recalled playing on top of them as a child.\u003c\/p\u003e\n\n\u003cp\u003eIn early January 2017 Michael Farmer received a photograph of a 107 kg pallasite, traveled to Nairobi, and purchased the stone. He returned two weeks later with Moritz Karl and was shown more than a ton of material stacked in two house compounds. The Bulletin records more than 2,800 kg found to date across a strewnfield over 45 km long, with individual masses ranging from under 1 kg to 500 kg. The type specimen of 48 g is held at Arizona State University, and the main mass is recorded with Michael Farmer, Moritz Karl, and Thomas Strope.\u003c\/p\u003e\n\n\u003cp\u003eThis specimen was acquired by Treasure Coast Meteorite Co. and prepared in house.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\n\u003cp\u003ePallasites pair olivine, a mantle silicate, with iron-nickel metal of the kind found in asteroid cores. Explaining how the two came to sit together in one rock is the central question the class poses, and the leading models involve mixing at a core and mantle boundary or the injection of molten metal into olivine during a large impact. Either way, a pallasite slice shows two parts of a differentiated asteroid that ordinarily never touch.\u003c\/p\u003e\n\n\u003cp\u003eThe olivine composition for Sericho is published as Fa12.3 plus or minus 0.1, with kamacite at 7.1 plus or minus 0.6 weight percent nickel. Those are measured values from the classification work, not estimates from appearance, and they are what distinguishes one pallasite from another once the stones are cut.\u003c\/p\u003e\n\n\u003cp\u003eBackground on the class is set out in \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat is a pallasite\u003c\/a\u003e, and the etched metal structure is covered in \u003ca href=\"\/pages\/widmanstatten-pattern-explained\"\u003ethe Widmanstatten pattern explained\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eThe story\u003c\/h2\u003e\n\u003cp\u003eSericho’s recovery began with lost camels. According to the Meteoritical Bulletin, in 2016 two brothers searching for their animals west of the village of Habaswein, south of Sericho in eastern Kenya, came across several large, unusually dense stones. There are no rocks in that area, so they decided the stones were meteorites, and they spent several weeks moving them home to Habaswein with engine hoists.\u003c\/p\u003e\n\u003cp\u003eThe stones were not new to the people who lived there. The Bulletin records that camel herders had known about the masses for decades, and that one village elder remembered playing on top of them with his brothers when he was a child.\u003c\/p\u003e\n\u003cp\u003eIn early January 2017, Michael Farmer received an email with a photo of a 107 kg “giant pallasite,” travelled to Nairobi and bought it. Two weeks later he returned to Kenya with Moritz Karl and went to Habaswein, where they were shown more than a ton of specimens stacked in the courtyards of two house compounds. The Bulletin records that more than 2,800 kg has been found to date.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSource: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?code=65717\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin entry for Sericho\u003c\/a\u003e, writeup from MB 106.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWhat the research reports\u003c\/h2\u003e\n\u003cp\u003eThe Meteoritical Bulletin classifies Sericho as a pallasite without assigning it to a group. The original classification in Meteoritical Bulletin 106 reported olivine and metal chemistry, including olivine Fa12.3 with an FeO\/MnO ratio of 57.4, but did not include the oxygen isotope or bulk metal trace-element data normally used to place a pallasite in a group. Later peer-reviewed studies have analyzed Sericho as a main group pallasite. Their findings come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. Until the Bulletin entry is updated, this listing uses the official classification.\u003c\/p\u003e\n\u003ch3\u003eWindmill et al. (2022): oxygen isotopes match the main group\u003c\/h3\u003e\n\u003cp\u003eR. J. Windmill, I. A. Franchi, J. L. Hellmann, J. M. Schneider, F. Spitzer, T. Kleine, R. C. Greenwood and M. Anand, of The Open University, the University of Münster, the Max Planck Institute for Solar System Research and the Natural History Museum, London, published \u003ca href=\"https:\/\/doi.org\/10.1093\/pnasnexus\/pgac015\" rel=\"noopener\" target=\"_blank\"\u003eIsotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System\u003c\/a\u003e (PNAS Nexus, volume 1, pgac015, 2022).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOxygen isotopes.\u003c\/strong\u003e Two Sericho olivine samples gave Δ17O values of −0.202 and −0.200 per mil, within the average the authors report for main group pallasite olivine of −0.197 ± 0.016 per mil. The study places Sericho with Seymchan in a low aluminium and manganese subgroup, noting that \"Sericho and Seymchan exhibit variable olivine–metal ratios yet have unresolvable Δ17O values.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFormation.\u003c\/strong\u003e The authors found an oxygen isotope mismatch between olivine and chromite in main group pallasites. They interpret it as evidence that the metal and the olivine came from two different bodies brought together by an impact, rather than forming together at a single core-mantle boundary.\u003c\/p\u003e\n\u003ch3\u003eJung et al. (2026): weathering and magnetism\u003c\/h3\u003e\n\u003cp\u003eJ.-I. Jung, S. Gaal, S. M. Tikoo, E. Lopes, J. Mells, D. H. Burns and R. G. Hatfield, of Stanford University, the University of Alabama and the University of Florida, published \u003ca href=\"https:\/\/doi.org\/10.1111\/maps.70217\" rel=\"noopener\" target=\"_blank\"\u003eMagnetization records of terrestrial weathering in the Sericho pallasite\u003c\/a\u003e (Meteoritics \u0026amp; Planetary Science, 2026).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClassification in the study.\u003c\/strong\u003e The authors describe their sample as \"the main group Sericho pallasite.\"\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFindings.\u003c\/strong\u003e Their sample contained fine magnetite grains inside iron oxide veins, likely goethite, formed by alteration after the meteorite reached Earth. The authors conclude that this secondary material dominates the sample's magnetic signal, so it cannot be used to recover the parent body's magnetic field, and they note that different samples of one meteorite can weather to very different degrees.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this a full slice or a part slice?\u003c\/strong\u003e\u003cbr\u003e\nA full slice. The cut runs the complete width of the stone, so the natural exterior margin is present all the way around the specimen rather than on one side only.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the coating, and does it affect the stated weight?\u003c\/strong\u003e\u003cbr\u003e\nThe finished faces are sealed with a clear epoxy coating. Pallasites contain iron-nickel metal, which corrodes in humid air if left bare, and the olivine grains sit in that metal, so a sealed surface protects both. The stated 103.50 g is the weight of the specimen as offered, coating included. Epoxy is a permanent treatment and is not intended to be removed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill I see a Widmanstatten pattern?\u003c\/strong\u003e\u003cbr\u003e\nNot as a bold crossed-band figure across the whole face. The Meteoritical Bulletin records that a well developed Widmanstatten pattern appears only in the occasional metal-rich region of Sericho. What the etch shows here is the swathing kamacite around the olivine grains and the darker plessite pockets between them.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is a total known weight of 2.8 tonnes quoted for a meteorite sold in gram sizes?\u003c\/strong\u003e\u003cbr\u003e\nThat figure is the recorded mass for the entire Sericho strewnfield, which extends more than 45 km and has produced many separate stones. It describes the find as a whole and says nothing about the size of any one specimen.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I verify the classification?\u003c\/strong\u003e\u003cbr\u003e\nThe entry is public. See the \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=65717\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin Database entry for Sericho\u003c\/a\u003e, and \u003ca href=\"\/pages\/meteoritical-bulletin-explained\"\u003eunderstanding the Meteoritical Bulletin\u003c\/a\u003e for how to read it. Treasure Coast Meteorite Co. is an IMCA member, number 3323.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\n\u003cp\u003ePallasite is a small class. As of September 2026 the Meteoritical Bulletin lists 99 approved pallasites out of more than 80,000 approved meteorites. Sericho is one of the few that has been recovered in enough quantity, and in good enough condition, to be cut into display slices at all, which is why it has become the pallasite most collectors meet first.\u003c\/p\u003e\n\n\u003cp\u003eA full slice at 103.50 g sits above the small end of that market. The complete cross section, both finished faces, and the intact natural margin make it a specimen that can be handled and displayed from either side. Other stony-iron material is listed in the \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003estony-iron meteorite collection\u003c\/a\u003e, and general background is indexed on the \u003ca href=\"\/pages\/learn-about-meteorites\"\u003elearn hub\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eClassification data on this page is reproduced from the \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=65717\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin Database entry for Sericho\u003c\/a\u003e, published in Meteoritical Bulletin 106.\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":46171476033583,"sku":"SER-10350-FS-EP","price":730.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/sericho-pallasite-103-50g-full-slice-obverse.jpg?v=1789272344"},{"product_id":"gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-84-69g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Slice, Ungrouped Pallasite, 84.69g, Tibet","description":"\u003ch2\u003eAn 84.69g etched slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is an 84.69 gram polished and etched slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau. It is a full-face section, and backlit, olivine crystals across the entire slice transmit gold and amber. Gyarub Zangbo is not a main group pallasite. The Meteoritical Society revised its classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eOlivine is distributed across the whole face, with dense crystal fields toward the margins and more open, metal-rich areas through the middle of the face. Grains range from small isolated crystals to larger clustered groups. The two faces are photographed separately, and the olivine pattern differs between them, as expected for a slice cut through a coarse aggregate.\u003c\/p\u003e\n\u003cp\u003eThe transmitted-light photographs show how many of the crystals remain translucent. Under strong backlight they read gold, amber and orange, while more weathered grains stay dark brown.\u003c\/p\u003e\n\u003cp\u003eThe metal between the crystals has been etched to reveal a fine crosshatched pattern, the intergrowth of kamacite and taenite that the Bulletin records as the metal phases in this meteorite. The macro photographs show the pattern clearly. The Bulletin describes Gyarub Zangbo as a coarse grained aggregate with a mean grain size of about 5 mm and a simple mineralogy of olivine and metal.\u003c\/p\u003e\n\u003cp\u003ePublished geochemistry from the Bulletin: olivine Fa21.6±0.4 with Fe\/Mn 66.9±3.9 (n=41). The MB 114 reclassification added orthopyroxene Fs19.1±2.3Wo2.0±0.8 (N=21), augite Fs8.2±0.4Wo43.0±1.6 (N=6) and two populations of chromite (Mg# 21.5±0.6 and 8.0±3.2), together with troilite, schreibersite and the phosphates stanfieldite and farringtonite. Oxygen isotopes reported in MB 114 give Δ17O of −2.262 and −2.2385‰ (H. Bao, Nanjing University) and −2.230‰ (D. Ibarra and R. Havel, Brown University). The Bulletin records a shock stage of low and a weathering grade of low.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy. The coating stabilizes the olivine and slows oxidation, and is standard practice for pallasite preservation.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo river in Xizang, China, at 33.126°N, 87.079°E. The recovery consisted of many disaggregated fragments of olivine and metal, with a larger metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass as being with him.\u003c\/p\u003e\n\u003cp\u003eThe type specimen, 120 g including two polished end cuts, is held at the Burke Museum of Natural History and Culture at the University of Washington. Classification was carried out by A. Irving at the University of Washington and P. Carpenter at Washington University in St. Louis, and the name was approved on 13 March 2021. This specimen was acquired by Treasure Coast Meteorite Co.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, which shares a parent body tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the Bulletin sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains pyroxene, which is absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, and carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group. Ga and Ge contents also separate it from both groups.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the 2023 studies report\u003c\/h2\u003e\n\u003cp\u003eTwo abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined Gyarub Zangbo in detail, and they remain the published research on this meteorite beyond the Bulletin itself. Their figures come from the authors' own samples and methods, not from the Bulletin, and are given here as the studies state them. The two groups analysed different material in different laboratories, so their numbers do not always agree.\u003c\/p\u003e\n\u003ch3\u003eJiang et al. (2023): an anomalous carbonaceous pallasite\u003c\/h3\u003e\n\u003cp\u003eY. Jiang, X. R. Zhang, W. Z. He, S. Y. Liao, C. Herd, Y. B. Peng and W. B. Hsu, of Purple Mountain Observatory, the University of Alberta and Nanjing University, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo: An anomalous carbonaceous pallasite\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #1183).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePetrography.\u003c\/strong\u003e The authors describe the interior as roughly 60 percent olivine and 36 percent metal by volume. The metal is mainly taenite decorated by wavy kamacite bands, and the minor phases are troilite, schreibersite, chromite, phosphate and pyroxene. Orthopyroxene grows on the edges of olivine grains or occurs scattered, and chromite occasionally sits on the contacts between olivine and metal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMineral chemistry.\u003c\/strong\u003e Olivine is highly homogeneous at Fa21.6±0.4 (Fe\/Mn 66.9±3.9, n=41), which the authors note is more iron-rich than the olivine of any other pallasite previously reported. Main group pallasite olivine, by comparison, runs Fa11 to 13. Orthopyroxene is magnesium-rich at En80.3±0.3Fs19.14±0.2Wo0.55±0.3 (Fe\/Mn 43.9±4.4, n=13). Two kinds of chromite are present, with Mg# of 21.5±0.6 and 8.0±3.2 and Cr# of 87.8±0.6 and 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal chemistry.\u003c\/strong\u003e Metal was analysed by ICP-MS at the University of Alberta:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel\u003c\/td\u003e\n\u003ctd\u003e15.8 wt%\u003c\/td\u003e\n\u003ctd\u003eCobalt\u003c\/td\u003e\n\u003ctd\u003e0.62 wt%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003ctd\u003e658 ppm\u003c\/td\u003e\n\u003ctd\u003eManganese\u003c\/td\u003e\n\u003ctd\u003e130 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArsenic\u003c\/td\u003e\n\u003ctd\u003e17.8 ppm\u003c\/td\u003e\n\u003ctd\u003eOsmium\u003c\/td\u003e\n\u003ctd\u003e16.8 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGermanium\u003c\/td\u003e\n\u003ctd\u003e14.6 ppm\u003c\/td\u003e\n\u003ctd\u003eGallium\u003c\/td\u003e\n\u003ctd\u003e12 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003ctd\u003e11.3 ppm\u003c\/td\u003e\n\u003ctd\u003eIridium\u003c\/td\u003e\n\u003ctd\u003e11 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePalladium\u003c\/td\u003e\n\u003ctd\u003e8.54 ppm\u003c\/td\u003e\n\u003ctd\u003eRuthenium\u003c\/td\u003e\n\u003ctd\u003e8.45 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003e1.91 ppm\u003c\/td\u003e\n\u003ctd\u003eTungsten\u003c\/td\u003e\n\u003ctd\u003e1.34 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhenium\u003c\/td\u003e\n\u003ctd\u003e1.01 ppm\u003c\/td\u003e\n\u003ctd\u003eAntimony\u003c\/td\u003e\n\u003ctd\u003e0.38 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTin\u003c\/td\u003e\n\u003ctd\u003e0.341 ppm\u003c\/td\u003e\n\u003ctd\u003eCadmium\u003c\/td\u003e\n\u003ctd\u003e0.009 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003e0.007 ppm\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eIsotopes.\u003c\/strong\u003e Olivine, hand-picked to remove weathered material, was analysed by laser fluorination at Nanjing University, giving δ17O = −1.294±0.006‰, δ18O = 1.824±0.005‰ and Δ17O = −2.262±0.004‰. Chromium isotopes gave ε54Cr of 3.05±0.32 and ε53Cr of 1.57±0.10, which the authors note are not corrected for cosmogenic effects. Gyarub Zangbo occupies a unique position on their combined oxygen and chromium isotope plot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e Compared with main group pallasites, Gyarub Zangbo olivine is richer in iron with lower Δ17O, and its metal carries more nickel and iridium. The authors see chemical affinities with carbonaceous pallasites, namely the Eagle Station grouplet (olivine Fa19 to 20) and the ungrouped carbonaceous pallasite Milton (Fa17.2). They describe the metal as IIF iron-like, with gallium similar to Milton but higher than the Eagle Station pallasites, and a tungsten depletion relative to osmium and iridium that is less pronounced than in either. They single out its low germanium content as its most notable feature, and conclude that mineral chemistry, olivine oxygen and chromium isotopes and metal chemistry together make Gyarub Zangbo an anomalous carbonaceous pallasite, sampled from an asteroid not previously represented in pallasite collections.\u003c\/p\u003e\n\u003ch3\u003eBoesenberg et al. (2023): the tenth pyroxene pallasite\u003c\/h3\u003e\n\u003cp\u003eJ. S. Boesenberg, M. Humayun, A. J. Irving and D. E. Ibarra, of Brown University, the National High Magnetic Field Laboratory at Florida State University and the University of Washington, published \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eNew pyroxene pallasites: Bordji Badji Mokhtar 001 and Gyarub Zangbo, and a plethora of pallasite parent bodies\u003c\/a\u003e (LPI Contrib. No. 2806, abstract #2392).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDiscovery of pyroxene.\u003c\/strong\u003e Gyarub Zangbo was first announced simply as a pallasite, and its olivine composition looked typical of the Eagle Station group, so the authors studied it mainly to analyse its metal. Electron microprobe work at Brown University then found orthopyroxene, making Gyarub Zangbo the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSilicates and chromite.\u003c\/strong\u003e The authors report that Gyarub Zangbo contains the most iron-rich olivine and chromite found in any pallasite. Olivine is Fa20.9 to 22.4 (Fe\/Mn 53 to 68), in grains up to 5 mm that range from rounded to angular. Orthopyroxene, Wo0.2En79.5 to Wo0.5En80.9 (Fe\/Mn 35 to 40, 0.12 to 0.17 wt% Cr2O3), occurs in coarse orthopyroxene, troilite and olivine intergrowths and as single rounded grains on the outer edges of larger olivines, mostly 50 to 200 microns across. Chromite is scarce and small, 20 to 40 microns, and low in aluminium (0.33 to 2.43 wt% Al2O3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMetal.\u003c\/strong\u003e Swathing kamacite and interior taenite are both present, with troilite and schreibersite. Metal analysed at Florida State University plots, on the gallium versus gold diagram, where main group pallasites merge with the IIIAB irons, and on the iridium versus gold diagram beyond the iridium-rich end of the main group, which the authors read as early crystallizing metal. Their measured gallium (15 ppm) is higher and germanium (24 ppm) lower than in Eagle Station pallasites (3 to 9 ppm gallium, 75 to 130 ppm germanium). Nickel is higher than in the IVB irons or Eagle Station pallasites, and together with gallium and germanium places the meteorite in ungrouped status. Oxygen isotopes were still pending when the abstract was written; later measurements appear in the MB 114 writeup above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInterpretation.\u003c\/strong\u003e The authors suggest that Gyarub Zangbo and Bordji Badji Mokhtar 001 likely share similar core crystallization histories, with iridium-rich metal pointing to crystallization that proceeded inward, while noting that other models are possible. They conclude that the number of pallasite parent bodies now stands at a minimum of 12, and argue that the shared textures of pallasites from so many different bodies point to a common differentiation and crystallization process rather than a dozen unrelated events.\u003c\/p\u003e\n\u003ch3\u003eWhere this leaves the science\u003c\/h3\u003e\n\u003cp\u003eThe carbonaceous connection matters because carbonaceous material is understood to have formed outside the orbit of Jupiter, which would place Gyarub Zangbo's parent body in the outer solar system. Both abstracts report active research rather than settled classification, and neither interpretation is part of the official Bulletin entry, which classifies the meteorite as Pallasite, ungrouped. More on this is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Its olivine chemistry, pyroxene content, oxygen isotopes, nickel content and IIF metal affinity together separate it from every established pallasite group.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the carbonaceous connection?\u003c\/strong\u003e Jiang and colleagues (2023) described Gyarub Zangbo as an anomalous carbonaceous pallasite on the basis of its mineral chemistry, olivine oxygen and chromium isotopes, and metal chemistry. That would place its parent body in the outer solar system. It is conference research and not part of the official Bulletin classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it a pyroxene pallasite?\u003c\/strong\u003e Boesenberg and colleagues (2023) identified orthopyroxene in Gyarub Zangbo and described it as the tenth known pyroxene pallasite. The Bulletin records orthopyroxene and augite in its MB 114 reclassification but classifies the meteorite as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when backlit?\u003c\/strong\u003e Olivine is the same mineral as the gemstone peridot, and fresh crystals are transparent to translucent. Weathering gradually turns olivine opaque, which is why some grains stay dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows the oxidation that darkens crystals over time, without changing how the slice looks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026 the Meteoritical Bulletin database records 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 84.69 grams this slice is sized for a display stand, where its translucency does the work. It pairs that with a classification shared by 17 approved meteorites as of September 2026, and with conference research that places its parent body in the carbonaceous reservoir and identifies it as the tenth known pyroxene pallasite.\u003c\/p\u003e\n\u003cp\u003eThis specimen carries serial TC-00043 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00043\"\u003eSpecimen Record TC-00043\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e\n","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":46186469818415,"sku":"GYARUB-ZANGBO-84-69G-SLICE-EP","price":1524.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-84.69g-polished-face.jpg?v=1789515063"},{"product_id":"gyarub-zangbo-pallasite-meteorite-full-slice-ungrouped-pallasite-324-46g-tibet","title":"Gyarub Zangbo Pallasite Meteorite Full Slice, Ungrouped Pallasite, 324.46g, Tibet","description":"\u003ch2\u003eA 324.46g metal-dominant full slice of Gyarub Zangbo, an ungrouped pallasite from Tibet\u003c\/h2\u003e\n\u003cp\u003eThis is a 324.46 gram full slice of Gyarub Zangbo, a pallasite recovered on the Qinghai-Tibet Plateau, and a sister slice to our \u003ca href=\"\/products\/gyarub-zangbo-pallasite-meteorite-slice-ungrouped-pallasite-301-28g-tibet\"\u003e301.28g slice, TC-00035\u003c\/a\u003e. This slice is overwhelmingly metal: broad fields of etched iron-nickel with olivine gathered into a few clusters near the margins. The Meteoritical Society revised the classification to Pallasite, ungrouped in Meteoritical Bulletin 114, published in 2026, and as of September 2026 it is 1 of 17 approved meteorites carrying that classification. For background on the type, see our guide on \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003ewhat a pallasite is\u003c\/a\u003e. The photographs show the exact specimen offered.\u003c\/p\u003e\n\n\u003ch2\u003eStructure and features of this slice\u003c\/h2\u003e\n\u003cp\u003eBoth faces are dominated by metal. The etch has brought up a dense network of fine crossing lines across the whole surface, and on a slice with this much open metal the pattern reads edge to edge rather than being broken up by silicate. The Bulletin records kamacite and taenite as the metal phases in Gyarub Zangbo.\u003c\/p\u003e\n\u003cp\u003eOlivine is concentrated rather than scattered. On one face it forms a connected cluster along one margin with a few isolated grains elsewhere; on the reverse the cluster sits on the opposite side, as expected when both faces of one cut are compared. Several larger grains are translucent amber under strong light, while others are deep brown to near black. A few grey-toned pockets hold smaller olivine grains, and a handful of darker inclusions sit alone in the metal. Those features are described here from the photographs only; the phases have not been analysed on this slice.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin describes Gyarub Zangbo material as dark brown olivine and metal in variable proportions from specimen to specimen. This slice sits at the metal-rich end of that range. By comparison, Jiang and colleagues (2023) described the interior of the sample they studied as roughly 60 percent olivine and 36 percent metal by volume, which shows how much a single mass of this meteorite can vary.\u003c\/p\u003e\n\u003cp\u003eBoth faces carry a thin protective epoxy coating. It stabilizes the olivine and slows oxidation of the metal, and the SKU carries the -EP suffix to disclose it.\u003c\/p\u003e\n\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was found in October 2020 by G. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of Gyarub Zangbo in Xizang, China, at 33.126 N, 87.079 E. The Bulletin records many disaggregated fragments of olivine and metal, along with a larger single metal-rich specimen found nearby. All of the material was purchased by Ziyao Wang in October and November 2020, and the Bulletin records the main mass with him.\u003c\/p\u003e\n\u003cp\u003eClassification was carried out by A. Irving, UWS, and P. Carpenter, WUSL, and the name was approved on 13 March 2021. The type specimen, 120 g including two polished end cuts, is held at the Burke Museum at the University of Washington. This slice was acquired by Treasure Coast Meteorite Co. and is a sister slice to TC-00035. The Bulletin does not document which recovered piece either slice was cut from, and we make no claim about it.\u003c\/p\u003e\n\u003cp\u003eThe Bulletin indexes a mass of 17.61 kg in 102 pieces from the original MB 110 entry. The MB 114 reclassification writeup states that the updated total mass is now more than 200 kg, so the indexed figure covers only the material in the first announcement. Browse related specimens in our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eMost pallasites belong to the main group, tied to the IIIAB irons. Gyarub Zangbo fits neither the main group nor the Eagle Station group, and the MB 114 writeup sets out why. Its olivine is close in composition to Eagle Station olivine but has lower Fe\/Mn ratios, and is clearly distinct from main group olivine. It contains orthopyroxene and augite, absent from both groups. Its oxygen isotopes fall on an array between main group and Eagle Station values without overlapping any other ungrouped pallasite. Its metal shows affinity with the IIF irons rather than the IIIAB irons, carries more nickel than the metal of the IVB irons, the Eagle Station pallasites and the main group, and its Ga and Ge contents separate it from both groups.\u003c\/p\u003e\n\u003cp\u003eFor a metal-dominant slice, that last point is the relevant one: nickel content, IIF affinity and Ga and Ge are all properties of the metal. Two abstracts presented at the 54th Lunar and Planetary Science Conference in 2023 examined it in detail: \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/1183.pdf\" rel=\"noopener\" target=\"_blank\"\u003eJiang et al., abstract #1183\u003c\/a\u003e, which describes Gyarub Zangbo as an anomalous carbonaceous pallasite, and \u003ca href=\"https:\/\/www.hou.usra.edu\/meetings\/lpsc2023\/pdf\/2392.pdf\" rel=\"noopener\" target=\"_blank\"\u003eBoesenberg et al., abstract #2392\u003c\/a\u003e, which identified orthopyroxene and described it as the tenth known pyroxene pallasite. Both report conference research rather than Bulletin classification. The full picture is on our \u003ca href=\"\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eGyarub Zangbo origin and science page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite officially classified?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially named meteorite, announced as a pallasite in Meteoritical Bulletin 110 (2022) and revised to Pallasite, ungrouped in Meteoritical Bulletin 114 (2026). Offered by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is there so little olivine on this slice?\u003c\/strong\u003e The Bulletin records olivine and metal in variable proportions from specimen to specimen. This slice comes from a metal-rich part of the meteorite, so the olivine is gathered in clusters near the margins rather than spread across the face.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this slice the same material as TC-00035?\u003c\/strong\u003e It is a sister slice to TC-00035, our 301.28g Gyarub Zangbo slice. Each carries its own serial and its own specimen record.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e It stabilizes the olivine and slows oxidation of the metal without changing how the slice looks. It is disclosed in the SKU with the -EP suffix.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow scarce is this classification?\u003c\/strong\u003e As of September 2026, the Meteoritical Bulletin lists this as 1 of 17 approved meteorites classified as Pallasite, ungrouped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs white glove delivery available?\u003c\/strong\u003e Yes. As a premium specimen, this slice qualifies for our \u003ca href=\"\/pages\/white-glove-service\"\u003ewhite glove service\u003c\/a\u003e, a fully insured, personal delivery at approved destinations. It is arranged on request before fulfillment, so contact us with your delivery location.\u003c\/p\u003e\n\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 324.46 grams this is a display slice, and its character comes from the metal. Paired with a classification shared by 17 approved meteorites as of September 2026, it puts the focus on the metal, which carries several of the lines of evidence the Bulletin gives for ungrouped status. Collectors who hold TC-00035 or another olivine-rich slice of this meteorite will find this one a direct counterpart.\u003c\/p\u003e\n\u003cp\u003eThis slice is part of our \u003ca href=\"\/collections\/premium-specimens\"\u003epremium specimens\u003c\/a\u003e and qualifies for our \u003ca href=\"\/pages\/white-glove-service\"\u003ewhite glove service\u003c\/a\u003e: fully insured, personal delivery at approved destinations, arranged on request.\u003c\/p\u003e\n\n\u003cp\u003eThis specimen carries serial TC-00045 in the Treasure Coast Meteorite Co. specimen record programme. Its permanent record, with identification data, provenance and photographs, is at \u003ca href=\"\/pages\/specimen-record-tc-00045\"\u003eSpecimen Record TC-00045\u003c\/a\u003e, and the full index is on the \u003ca href=\"\/pages\/specimen-registry\"\u003especimen registry\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMeteoritical Bulletin entry:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite, ungrouped | Find, Xizang, China, October 2020 | MB 110 (2022), reclassified MB 114 (2026) | IMCA #3323\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":46204780150831,"sku":"GYARUB-ZANGBO-324.46G-SLICE-EP","price":5840.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/gyarub-zangbo-pallasite-324.46g-polished-face.jpg?v=1789697644"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/collections\/seymchan-pallasite-pmg-286.28g-full-slice-backlit-2.jpg?v=1789965017","url":"https:\/\/www.tcmeteorites.com\/collections\/pallasites.oembed","provider":"Treasure Coast Meteorite Co.","version":"1.0","type":"link"}