{"title":"Stony-Iron Meteorites","description":"\u003cp\u003eStony-iron meteorites are the rarest of the three major meteorite classes, with roughly equal proportions of silicate minerals and nickel-iron metal. They include some of the most visually spectacular specimens known, especially pallasites, where translucent olivine crystals are suspended in a polished metal matrix. Unless specifically stated in the listing, specimens in this collection are Meteoritical Bulletin classified.\u003c\/p\u003e\n\n\u003ch2\u003eHow we verify stony-iron meteorites are real\u003c\/h2\u003e\n\u003cp\u003eEvery specimen is tied to a Meteoritical Bulletin entry, the official global registry of classified meteorites maintained by the Meteoritical Society. Classification is performed by accredited laboratories that confirm metal composition, olivine chemistry, and parent body affinity. The Bulletin record is the definitive proof of authenticity, beyond any visual or magnetic test. Read more: \u003ca href=\"\/pages\/meteoritical-bulletin-explained\"\u003eThe Meteoritical Bulletin Explained\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eTwo main types\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePallasites\u003c\/strong\u003e are believed to form at the boundary between the molten metallic core and the silicate mantle of a differentiated asteroid. They contain large gem-quality olivine crystals embedded in nickel-iron metal. When cut and polished, pallasite slices can transmit light through the olivine, producing one of the most striking visual effects in all of meteoritics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMesosiderites\u003c\/strong\u003e are breccias of metal and basaltic silicates that likely formed when a metallic asteroid core collided with the basaltic crust of another differentiated body. They lack the translucent olivine of pallasites but show dramatic textural contrasts between metal and dark silicate clasts.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow can I tell a pallasite is real?\u003c\/strong\u003e Authentic pallasites have a Meteoritical Bulletin classification, ship with documentation, and show characteristic olivine crystal habit and nickel-iron Widmanstatten structure when etched. Read more: \u003ca href=\"\/pages\/how-can-you-tell-if-a-meteorite-is-real\"\u003eHow Can You Tell if a Meteorite Is Real?\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre pallasites and mesosiderites magnetic?\u003c\/strong\u003e Yes. Both contain substantial nickel-iron metal that is strongly magnetic, although individual olivine or silicate clasts within them are not. Read more: \u003ca href=\"\/pages\/are-meteorites-magnetic\"\u003eAre Meteorites Magnetic?\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy are pallasites so expensive?\u003c\/strong\u003e Pallasites are among the rarest meteorite types by mass and the most visually desirable. Combined supply across all known pallasites is small, and gem-quality specimens command premium prices. Read more: \u003ca href=\"\/pages\/how-much-do-meteorites-cost\"\u003eHow Much Do Meteorites Cost?\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill pallasite slices tarnish or rust?\u003c\/strong\u003e Yes, the metal matrix can oxidize if exposed to humidity. Store pallasites in low humidity conditions, ideally with silica gel desiccant, and avoid bare-finger handling on polished faces.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these specimens authenticated?\u003c\/strong\u003e Unless otherwise noted, every stony-iron meteorite here has a Meteoritical Bulletin record and ships with a Treasure Coast Meteorite Co. certificate of authenticity.\u003c\/p\u003e\n\n\u003cp\u003eSee also: \u003ca href=\"\/collections\/iron-meteorites\"\u003eIron Meteorites\u003c\/a\u003e · \u003ca href=\"\/collections\/chondrites\"\u003eChondrites\u003c\/a\u003e · \u003ca href=\"\/collections\/hed-meteorites\"\u003eHED Meteorites\u003c\/a\u003e · \u003ca href=\"\/pages\/types-of-meteorites\"\u003eTypes of Meteorites\u003c\/a\u003e · \u003ca href=\"\/pages\/are-meteorites-illegal-to-own\"\u003eAre Meteorites Illegal to Own?\u003c\/a\u003e\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\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\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\u003ch2\u003eStructure and features\u003c\/h2\u003e\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\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\u003ch2\u003eScientific context\u003c\/h2\u003e\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. The Sericho fall represents one of the most significant 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\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. Pallasites account for less than 1% of all classified meteorites, making them among the rarest samples available from asteroid interiors. 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\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\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\" target=\"_blank\" rel=\"noopener\"\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\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\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\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\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\u003ch2\u003eCollector significance\u003c\/h2\u003e\u003cp\u003ePallasites represent the rarest structural class among meteorites, and Sericho material combines scientific importance with exceptional visual clarity. 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\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\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Sericho\u0026amp;sfor=names\" target=\"_blank\" rel=\"noopener\"\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":true}],"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\u003eComplete cross-section with etched metal and olivine structure\u003c\/h2\u003e\n\u003cp\u003eThis 94.90-gram full slice exposes the complete internal architecture of Gyarub Zangbo pallasite: translucent olivine crystals embedded in a nickel-iron matrix that has been acid-etched to reveal the kamacite-taenite intergrowth structure. The etching process brings out the metal's crystallographic texture, creating contrast between the metallic phases and the silicate inclusions. Professional stabilization using Paraloid B-72 on edges and microcrystalline wax on cut faces protects the specimen without adding artificial weight, no epoxy coating distorts the stated mass.\u003c\/p\u003e\n\u003cp\u003eThe slice displays olivine distribution patterns characteristic of pallasite formation at a core-mantle boundary interface. Crystal sizes vary across the section, with some olivines showing the yellow-green peridot coloration that makes pallasites visually distinct among meteorite types. The metal framework shows geometric relationships between adjacent olivine grains, documenting the slow cooling history that allowed large silicate crystals to grow within molten metal.\u003c\/p\u003e\n\u003cp\u003eSurface treatment follows museum conservation protocols. The stated weight represents the meteorite material itself, not added stabilizers. Many commercially available iron and stony-iron meteorites carry thick epoxy coatings that can constitute up to half the listed mass. This specimen's preparation prioritizes scientific integrity and long-term preservation without mass inflation.\u003c\/p\u003e\n\u003ch2\u003eEtched metal reveals crystallographic structure\u003c\/h2\u003e\n\u003cp\u003eAcid etching removes oxidized surface layers and preferentially attacks kamacite lamellae in the iron-nickel matrix, creating relief that highlights the metal's internal structure. This pallasite shows geometric boundaries where metal grains meet olivine crystals, documenting the specimen's thermal history. The etching brings out subtle variations in nickel content across different metal phases, visible as lighter and darker regions in the matrix.\u003c\/p\u003e\n\u003cp\u003eOlivine crystals appear as discrete grains with irregular margins where they contacted molten metal during formation. Some crystals show fractures from shock events in the parent body's history. The metal framework forms a three-dimensional network around the silicate inclusions, a texture that formed as the olivine-metal mixture solidified at the boundary between a rocky mantle and metallic core.\u003c\/p\u003e\n\u003cp\u003eStabilization with Paraloid B-72 and microcrystalline wax prevents oxidation of freshly exposed metal surfaces while remaining invisible and reversible. These materials meet conservation standards used by natural history collections worldwide. The treatment does not alter the specimen's appearance or add measurable weight.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003ePallasites formed at core-mantle boundaries within differentiated asteroids that underwent complete internal melting and separation into metallic cores and rocky mantles. The olivine-metal mixture characteristic of these meteorites represents material from the interface zone where core and mantle were in contact. Gyarub Zangbo's classification as an ungrouped pallasite indicates it does not match the chemical and isotopic signatures of the main pallasite group, suggesting it originated from a distinct parent body with its own differentiation history.\u003c\/p\u003e\n\u003cp\u003eThe olivine crystals in pallasites have the same composition as the gemstone peridot. These silicate minerals formed at high temperatures in the asteroid's mantle, then became incorporated into metallic melt during impact disruption or other processes that mixed core and mantle materials. Slow cooling over millions of years allowed the metal to develop its crystallographic structure while olivine grains remained suspended in the solidifying matrix.\u003c\/p\u003e\n\u003cp\u003eStony-iron meteorites constitute less than 2% of all meteorite falls, making them significantly less common than pure stone or pure iron types. Pallasites represent the majority of stony-iron specimens but remain rare in collections. For context on meteorite types and formation environments, see \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Gyarub Zangbo is classified in the Meteoritical Bulletin as an ungrouped pallasite found in Tibet in 2020. View the official entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Gyarub%20Zangbo\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e. This specimen includes a certificate of authenticity documenting its classification and provenance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does \"ungrouped\" mean for a pallasite?\u003c\/strong\u003e Ungrouped classification indicates this meteorite's chemical and isotopic composition does not match the main pallasite group (PMG) or other established pallasite subgroups. It represents a distinct parent body with its own differentiation and cooling history, making it scientifically significant as a sample from a separate asteroid population.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat stabilization methods were used?\u003c\/strong\u003e Edges are sealed with Paraloid B-72 acrylic resin, and cut faces are treated with microcrystalline wax. Both are standard museum conservation materials that prevent oxidation without adding visible coatings. These treatments are reversible and add no measurable weight to the specimen.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e The 94.90g slice and a certificate of authenticity. No display stand is included unless separately noted.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the weight stated as \"true weight, no epoxy\"?\u003c\/strong\u003e Many iron and stony-iron meteorites sold commercially are coated in thick epoxy that can constitute 30-50% of the stated mass. This specimen uses only conservation-grade stabilizers that do not add artificial weight, so the 94.90g represents actual meteorite material.\u003c\/p\u003e\n\u003ch2\u003eDisplay and collection value\u003c\/h2\u003e\n\u003cp\u003eFull slices showing complete cross-sections through pallasite structure command premium positioning in meteorite collections. This specimen's size provides sufficient surface area to display both the olivine distribution pattern and the etched metal structure, while remaining practical for cabinet display. The etching enhances visual contrast between metal and silicate phases, making the specimen's internal architecture immediately apparent.\u003c\/p\u003e\n\u003cp\u003eUngrouped classification adds scientific interest. While main group pallasites (PMG) represent samples from a single well-studied parent body, ungrouped specimens document the diversity of asteroid differentiation processes across the early solar system. Collectors building reference collections of pallasite types require ungrouped examples to represent this diversity. The Tibet find location adds geographic interest to provenance documentation.\u003c\/p\u003e\n\u003cp\u003eMuseum-grade stabilization ensures long-term preservation without the visual degradation that affects untreated iron-bearing meteorites. The absence of epoxy coating allows direct observation of the meteorite's natural surface features. Browse additional specimens in the \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites\u003c\/a\u003e collection or explore other \u003ca href=\"\/collections\/premium-specimens\"\u003ePremium Specimens\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Gyarub%20Zangbo\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Tibet, 2020\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","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, PMG, 9.33g, Olivine in Iron-Nickel Matrix","description":"\u003ch2\u003eA polished cross-section through an asteroid's core-mantle boundary\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 Widmanstatten 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 main group pallasite metal.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003ePallasites are among the rarest meteorite types, fewer than 200 are classified, representing less than 0.2% of all known meteorites. Main group pallasites (PMG) are the largest and best-studied subset, linked geochemically to the IIIAB iron meteorite group and interpreted as samples from the core-mantle boundary of a single differentiated asteroid parent body.\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\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\u003eWhat is a main group pallasite?\u003c\/strong\u003e Main group pallasites (PMG) are the largest and most studied pallasite subset, linked geochemically to the IIIAB iron meteorite group. They are interpreted as samples from the core-mantle boundary of a single differentiated asteroid. Sericho belongs to this group.\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. Sericho is the most accessible entry point into pallasite collecting, offering genuine main group pallasite material at a price point that rarer pallasites like Fukang or Imilac cannot approach. 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 (PMG) | 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, PMG, 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 in proportions that place Sericho at the high end of olivine content for main group pallasites. 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 suspended in liquid metal at 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\u003eMain group pallasites represent samples from the core-mantle boundary of a disrupted asteroid, formed when olivine-rich mantle material mixed with liquid metal from the core during differentiation. Geochemical analysis links PMG pallasites to the IIIAB iron group, suggesting a common parent body. 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\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 main group pallasite. 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\u003eWhat does PMG mean?\u003c\/strong\u003e PMG stands for pallasite main group, the largest subset of pallasites linked by oxygen isotope ratios and trace element chemistry to a single parent body. Main group pallasites are geochemically distinct from the smaller Eagle Station and pyroxene pallasite subgroups.\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, PMG | 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\u003eAn ungrouped pallasite from a unique parent body with translucent olivine\u003c\/h2\u003e\n\u003cp\u003eThis slice of Gyarub Zangbo is not a typical pallasite. Geochemical analysis of its olivine and metallic phases, combined with oxygen and chromium isotope data, confirms that Gyarub Zangbo originated from a parent body distinct from all other known pallasites. It is classified as an ungrouped pallasite, a designation confirmed by the Meteoritical Society in MB 114 (April 2026) that places it outside all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eHold this slice up to light and the olivine crystals shift from dark olive-green to glowing amber and orange. Some crystals retain genuine translucency despite the terrestrial weathering that has darkened most of the olivine toward brown and black. The metallic matrix between the crystals shows the characteristic polished luster of iron-nickel alloy, with the Widmanstatten structure visible in etched zones at the edges of the metal. This slice carries a thin protective epoxy coating applied to both faces to preserve the olivine and slow further oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo's olivine fayalite content is Fa21.6-22.8 mol%, slightly higher than typical main group pallasites and consistent with its ungrouped status. The metallic component contains approximately 15.8% nickel, also elevated relative to most main group pallasites, and trace amounts of cobalt, copper, and germanium that further distinguish it from the PMG parent body.\u003c\/p\u003e\n\u003cp\u003eThe olivine crystals in this specimen range from small sub-millimeter grains to clusters several centimeters across, distributed heterogeneously across the polished face. The left portion of the slice shows denser crystal packing; the right section has larger metal-rich zones. The natural edge along the top of the slice retains the weathered exterior of the original stone, with visible oxidation showing the specimen's surface exposure history on the Tibetan plateau.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was discovered in October 2020 by Mr. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo River in Tibet, China. The find comprised disaggregated olivine and metal fragments scattered across the surface, along with a larger metal-rich mass nearby. The total recovered weight was approximately 17.6 kilograms, making Gyarub Zangbo one of the rarest pallasites available to collectors by total known weight.\u003c\/p\u003e\n\u003cp\u003eThe remote plateau environment preserved the specimens from human disturbance while subjecting them to high-altitude weathering. The result is a pallasite with significant surface oxidation on natural faces but excellent interior preservation where the polished slice reveals the original olivine-metal structure. 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\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe ungrouped classification of Gyarub Zangbo is its most scientifically significant attribute. Main group pallasites, the most common type, including Sericho, Esquel, and Brenham,  share a common parent body linked to the IIIAB iron meteorite group. Gyarub Zangbo does not. Its oxygen isotopic signatures plot along an array between PMG and Eagle Station pallasite values but do not overlap with any other known ungrouped pallasites. The metal composition shows affinity with IIF irons rather than the IIIAB irons linked to the main group, and nickel content is elevated above both Eagle Station and PMG values. These data collectively confirm a parent body distinct from all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eThis makes Gyarub Zangbo a window into a differentiated parent body not represented by any other pallasite in collections. The reclassification to ungrouped in MB 114 (revised April 2026) reflects the current official classification. A 2023 paper by Jiang et al. presented at the 54th Lunar and Planetary Science Conference proposed that Gyarub Zangbo may have carbonaceous origins consistent with formation beyond Jupiter's orbit, based on its oxygen isotope array and olivine chemistry. While this interpretation has not been incorporated into the official Meteoritical Bulletin classification, it represents active scientific inquiry that adds a layer of interest few other pallasites can claim. Browse our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e for related specimens.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially classified meteorite. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Gyarub Zangbo\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\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Most pallasites belong to the main group (PMG) and share a single parent body. Gyarub Zangbo is classified as ungrouped (confirmed in MB 114, April 2026) because its olivine chemistry, nickel content, and oxygen isotope ratios do not match the PMG, Eagle Station group, or any other established pallasite group. Its metal shows affinity with IIF irons rather than IIIAB, placing its parent body outside the known pallasite family tree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when held to light?\u003c\/strong\u003e Fresh pallasite olivine is transparent to translucent, and many crystals in this specimen retain enough translucency to transmit light. The amber and orange glow visible when the slice is backlit is the natural color of the olivine itself, the same mineral as the gemstone peridot. Terrestrial weathering gradually makes olivine opaque, but Gyarub Zangbo's relatively recent discovery means many crystals preserve this optical quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e The thin epoxy applied to both faces stabilizes the olivine crystals and slows further terrestrialization, the oxidation process that gradually darkens and opacifies the olivine. It does not affect the visual quality of the specimen and is standard practice for pallasite preservation.\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. This slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 17.6 kilograms total known weight, Gyarub Zangbo is among the rarest pallasites by total mass, rarer than Fukang, rarer than most named pallasites in collector circulation. Its anomalous classification adds scientific significance beyond simple rarity: this is a meteorite from a parent body not represented by any other known specimen. For collectors building a serious pallasite collection or a scientifically representative stony-iron suite, Gyarub Zangbo occupies a category that no other available specimen can fill. The backlit olivine quality in this lot is exceptional for a specimen of this age and exposure history.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Xizang, China, 2020 | Total known weight: 17.61kg | MB 110 (2022), revised MB 114 (2026)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","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":true}],"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, 64.0g, Tibet","description":"\u003ch2\u003eAn ungrouped pallasite from a unique parent body with translucent olivine\u003c\/h2\u003e\n\u003cp\u003eThis slice of Gyarub Zangbo is not a typical pallasite. Geochemical analysis of its olivine and metallic phases, combined with oxygen and chromium isotope data, confirms that Gyarub Zangbo originated from a parent body distinct from all other known pallasites. It is classified as an ungrouped pallasite, a designation confirmed by the Meteoritical Society in MB 114 (April 2026) that places it outside all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eHold this slice up to light and the olivine crystals shift from dark olive-green to glowing amber and orange. Some crystals retain genuine translucency despite the terrestrial weathering that has darkened most of the olivine toward brown and black. The metallic matrix between the crystals shows the characteristic polished luster of iron-nickel alloy, with the Widmanstatten structure visible in etched zones at the edges of the metal. This slice carries a thin protective epoxy coating applied to both faces to preserve the olivine and slow further oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo's olivine fayalite content is Fa21.6-22.8 mol%, slightly higher than typical main group pallasites and consistent with its ungrouped status. The metallic component contains approximately 15.8% nickel, also elevated relative to most main group pallasites, and trace amounts of cobalt, copper, and germanium that further distinguish it from the PMG parent body.\u003c\/p\u003e\n\u003cp\u003eThe olivine crystals in this specimen range from small sub-millimeter grains to clusters several centimeters across, distributed heterogeneously across the polished face. The left portion of the slice shows denser crystal packing; the right section has larger metal-rich zones. The natural edge along the top of the slice retains the weathered exterior of the original stone, with visible oxidation showing the specimen's surface exposure history on the Tibetan plateau.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was discovered in October 2020 by Mr. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo River in Tibet, China. The find comprised disaggregated olivine and metal fragments scattered across the surface, along with a larger metal-rich mass nearby. The total recovered weight was approximately 17.6 kilograms, making Gyarub Zangbo one of the rarest pallasites available to collectors by total known weight.\u003c\/p\u003e\n\u003cp\u003eThe remote plateau environment preserved the specimens from human disturbance while subjecting them to high-altitude weathering. The result is a pallasite with significant surface oxidation on natural faces but excellent interior preservation where the polished slice reveals the original olivine-metal structure. 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\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe ungrouped classification of Gyarub Zangbo is its most scientifically significant attribute. Main group pallasites, the most common type, including Sericho, Esquel, and Brenham,  share a common parent body linked to the IIIAB iron meteorite group. Gyarub Zangbo does not. Its oxygen isotopic signatures plot along an array between PMG and Eagle Station pallasite values but do not overlap with any other known ungrouped pallasites. The metal composition shows affinity with IIF irons rather than the IIIAB irons linked to the main group, and nickel content is elevated above both Eagle Station and PMG values. These data collectively confirm a parent body distinct from all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eThis makes Gyarub Zangbo a window into a differentiated parent body not represented by any other pallasite in collections. The reclassification to ungrouped in MB 114 (revised April 2026) reflects the current official classification. A 2023 paper by Jiang et al. presented at the 54th Lunar and Planetary Science Conference proposed that Gyarub Zangbo may have carbonaceous origins consistent with formation beyond Jupiter's orbit, based on its oxygen isotope array and olivine chemistry. While this interpretation has not been incorporated into the official Meteoritical Bulletin classification, it represents active scientific inquiry that adds a layer of interest few other pallasites can claim. Browse our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e for related specimens.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially classified meteorite. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Gyarub Zangbo\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\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Most pallasites belong to the main group (PMG) and share a single parent body. Gyarub Zangbo is classified as ungrouped (confirmed in MB 114, April 2026) because its olivine chemistry, nickel content, and oxygen isotope ratios do not match the PMG, Eagle Station group, or any other established pallasite group. Its metal shows affinity with IIF irons rather than IIIAB, placing its parent body outside the known pallasite family tree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when held to light?\u003c\/strong\u003e Fresh pallasite olivine is transparent to translucent, and many crystals in this specimen retain enough translucency to transmit light. The amber and orange glow visible when the slice is backlit is the natural color of the olivine itself, the same mineral as the gemstone peridot. Terrestrial weathering gradually makes olivine opaque, but Gyarub Zangbo's relatively recent discovery means many crystals preserve this optical quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e The thin epoxy applied to both faces stabilizes the olivine crystals and slows further terrestrialization, the oxidation process that gradually darkens and opacifies the olivine. It does not affect the visual quality of the specimen and is standard practice for pallasite preservation.\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. This slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 17.6 kilograms total known weight, Gyarub Zangbo is among the rarest pallasites by total mass, rarer than Fukang, rarer than most named pallasites in collector circulation. Its anomalous classification adds scientific significance beyond simple rarity: this is a meteorite from a parent body not represented by any other known specimen. For collectors building a serious pallasite collection or a scientifically representative stony-iron suite, Gyarub Zangbo occupies a category that no other available specimen can fill. The backlit olivine quality in this lot is exceptional for a specimen of this age and exposure history.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Xizang, China, 2020 | Total known weight: 17.61kg | MB 110 (2022), revised MB 114 (2026)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45269576777775,"sku":"GYARUB-ZANGBO-64.0G-SLICE-EP","price":1150.0,"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\u003eAn ungrouped pallasite from a unique parent body with translucent olivine\u003c\/h2\u003e\n\u003cp\u003eThis slice of Gyarub Zangbo is not a typical pallasite. Geochemical analysis of its olivine and metallic phases, combined with oxygen and chromium isotope data, confirms that Gyarub Zangbo originated from a parent body distinct from all other known pallasites. It is classified as an ungrouped pallasite, a designation confirmed by the Meteoritical Society in MB 114 (April 2026) that places it outside all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eHold this slice up to light and the olivine crystals shift from dark olive-green to glowing amber and orange. Some crystals retain genuine translucency despite the terrestrial weathering that has darkened most of the olivine toward brown and black. The metallic matrix between the crystals shows the characteristic polished luster of iron-nickel alloy, with the Widmanstatten structure visible in etched zones at the edges of the metal. This slice carries a thin protective epoxy coating applied to both faces to preserve the olivine and slow further oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo's olivine fayalite content is Fa21.6-22.8 mol%, slightly higher than typical main group pallasites and consistent with its ungrouped status. The metallic component contains approximately 15.8% nickel, also elevated relative to most main group pallasites, and trace amounts of cobalt, copper, and germanium that further distinguish it from the PMG parent body.\u003c\/p\u003e\n\u003cp\u003eThe olivine crystals in this specimen range from small sub-millimeter grains to clusters several centimeters across, distributed heterogeneously across the polished face. The left portion of the slice shows denser crystal packing; the right section has larger metal-rich zones. The natural edge along the top of the slice retains the weathered exterior of the original stone, with visible oxidation showing the specimen's surface exposure history on the Tibetan plateau.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was discovered in October 2020 by Mr. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo River in Tibet, China. The find comprised disaggregated olivine and metal fragments scattered across the surface, along with a larger metal-rich mass nearby. The total recovered weight was approximately 17.6 kilograms, making Gyarub Zangbo one of the rarest pallasites available to collectors by total known weight.\u003c\/p\u003e\n\u003cp\u003eThe remote plateau environment preserved the specimens from human disturbance while subjecting them to high-altitude weathering. The result is a pallasite with significant surface oxidation on natural faces but excellent interior preservation where the polished slice reveals the original olivine-metal structure. 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\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe ungrouped classification of Gyarub Zangbo is its most scientifically significant attribute. Main group pallasites, the most common type, including Sericho, Esquel, and Brenham,  share a common parent body linked to the IIIAB iron meteorite group. Gyarub Zangbo does not. Its oxygen isotopic signatures plot along an array between PMG and Eagle Station pallasite values but do not overlap with any other known ungrouped pallasites. The metal composition shows affinity with IIF irons rather than the IIIAB irons linked to the main group, and nickel content is elevated above both Eagle Station and PMG values. These data collectively confirm a parent body distinct from all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eThis makes Gyarub Zangbo a window into a differentiated parent body not represented by any other pallasite in collections. The reclassification to ungrouped in MB 114 (revised April 2026) reflects the current official classification. A 2023 paper by Jiang et al. presented at the 54th Lunar and Planetary Science Conference proposed that Gyarub Zangbo may have carbonaceous origins consistent with formation beyond Jupiter's orbit, based on its oxygen isotope array and olivine chemistry. While this interpretation has not been incorporated into the official Meteoritical Bulletin classification, it represents active scientific inquiry that adds a layer of interest few other pallasites can claim. Browse our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e for related specimens.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially classified meteorite. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Gyarub Zangbo\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\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Most pallasites belong to the main group (PMG) and share a single parent body. Gyarub Zangbo is classified as ungrouped (confirmed in MB 114, April 2026) because its olivine chemistry, nickel content, and oxygen isotope ratios do not match the PMG, Eagle Station group, or any other established pallasite group. Its metal shows affinity with IIF irons rather than IIIAB, placing its parent body outside the known pallasite family tree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when held to light?\u003c\/strong\u003e Fresh pallasite olivine is transparent to translucent, and many crystals in this specimen retain enough translucency to transmit light. The amber and orange glow visible when the slice is backlit is the natural color of the olivine itself, the same mineral as the gemstone peridot. Terrestrial weathering gradually makes olivine opaque, but Gyarub Zangbo's relatively recent discovery means many crystals preserve this optical quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e The thin epoxy applied to both faces stabilizes the olivine crystals and slows further terrestrialization, the oxidation process that gradually darkens and opacifies the olivine. It does not affect the visual quality of the specimen and is standard practice for pallasite preservation.\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. This slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 17.6 kilograms total known weight, Gyarub Zangbo is among the rarest pallasites by total mass, rarer than Fukang, rarer than most named pallasites in collector circulation. Its anomalous classification adds scientific significance beyond simple rarity: this is a meteorite from a parent body not represented by any other known specimen. For collectors building a serious pallasite collection or a scientifically representative stony-iron suite, Gyarub Zangbo occupies a category that no other available specimen can fill. The backlit olivine quality in this lot is exceptional for a specimen of this age and exposure history.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Xizang, China, 2020 | Total known weight: 17.61kg | MB 110 (2022), revised MB 114 (2026)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45270144024623,"sku":"GYARUB-ZANGBO-54.18G-SLICE-EP","price":975.0,"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\u003eAn ungrouped pallasite from a unique parent body with translucent olivine\u003c\/h2\u003e\n\u003cp\u003eThis slice of Gyarub Zangbo is not a typical pallasite. Geochemical analysis of its olivine and metallic phases, combined with oxygen and chromium isotope data, confirms that Gyarub Zangbo originated from a parent body distinct from all other known pallasites. It is classified as an ungrouped pallasite, a designation confirmed by the Meteoritical Society in MB 114 (April 2026) that places it outside all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eHold this slice up to light and the olivine crystals shift from dark olive-green to glowing amber and orange. Some crystals retain genuine translucency despite the terrestrial weathering that has darkened most of the olivine toward brown and black. The metallic matrix between the crystals shows the characteristic polished luster of iron-nickel alloy, with the Widmanstatten structure visible in etched zones at the edges of the metal. This slice carries a thin protective epoxy coating applied to both faces to preserve the olivine and slow further oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo's olivine fayalite content is Fa21.6-22.8 mol%, slightly higher than typical main group pallasites and consistent with its ungrouped status. The metallic component contains approximately 15.8% nickel, also elevated relative to most main group pallasites, and trace amounts of cobalt, copper, and germanium that further distinguish it from the PMG parent body.\u003c\/p\u003e\n\u003cp\u003eThe olivine crystals in this specimen range from small sub-millimeter grains to clusters several centimeters across, distributed heterogeneously across the polished face. The left portion of the slice shows denser crystal packing; the right section has larger metal-rich zones. The natural edge along the top of the slice retains the weathered exterior of the original stone, with visible oxidation showing the specimen's surface exposure history on the Tibetan plateau.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was discovered in October 2020 by Mr. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo River in Tibet, China. The find comprised disaggregated olivine and metal fragments scattered across the surface, along with a larger metal-rich mass nearby. The total recovered weight was approximately 17.6 kilograms, making Gyarub Zangbo one of the rarest pallasites available to collectors by total known weight.\u003c\/p\u003e\n\u003cp\u003eThe remote plateau environment preserved the specimens from human disturbance while subjecting them to high-altitude weathering. The result is a pallasite with significant surface oxidation on natural faces but excellent interior preservation where the polished slice reveals the original olivine-metal structure. 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\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe ungrouped classification of Gyarub Zangbo is its most scientifically significant attribute. Main group pallasites, the most common type, including Sericho, Esquel, and Brenham,  share a common parent body linked to the IIIAB iron meteorite group. Gyarub Zangbo does not. Its oxygen isotopic signatures plot along an array between PMG and Eagle Station pallasite values but do not overlap with any other known ungrouped pallasites. The metal composition shows affinity with IIF irons rather than the IIIAB irons linked to the main group, and nickel content is elevated above both Eagle Station and PMG values. These data collectively confirm a parent body distinct from all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eThis makes Gyarub Zangbo a window into a differentiated parent body not represented by any other pallasite in collections. The reclassification to ungrouped in MB 114 (revised April 2026) reflects the current official classification. A 2023 paper by Jiang et al. presented at the 54th Lunar and Planetary Science Conference proposed that Gyarub Zangbo may have carbonaceous origins consistent with formation beyond Jupiter's orbit, based on its oxygen isotope array and olivine chemistry. While this interpretation has not been incorporated into the official Meteoritical Bulletin classification, it represents active scientific inquiry that adds a layer of interest few other pallasites can claim. Browse our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e for related specimens.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially classified meteorite. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Gyarub Zangbo\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\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Most pallasites belong to the main group (PMG) and share a single parent body. Gyarub Zangbo is classified as ungrouped (confirmed in MB 114, April 2026) because its olivine chemistry, nickel content, and oxygen isotope ratios do not match the PMG, Eagle Station group, or any other established pallasite group. Its metal shows affinity with IIF irons rather than IIIAB, placing its parent body outside the known pallasite family tree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when held to light?\u003c\/strong\u003e Fresh pallasite olivine is transparent to translucent, and many crystals in this specimen retain enough translucency to transmit light. The amber and orange glow visible when the slice is backlit is the natural color of the olivine itself, the same mineral as the gemstone peridot. Terrestrial weathering gradually makes olivine opaque, but Gyarub Zangbo's relatively recent discovery means many crystals preserve this optical quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e The thin epoxy applied to both faces stabilizes the olivine crystals and slows further terrestrialization, the oxidation process that gradually darkens and opacifies the olivine. It does not affect the visual quality of the specimen and is standard practice for pallasite preservation.\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. This slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 17.6 kilograms total known weight, Gyarub Zangbo is among the rarest pallasites by total mass, rarer than Fukang, rarer than most named pallasites in collector circulation. Its anomalous classification adds scientific significance beyond simple rarity: this is a meteorite from a parent body not represented by any other known specimen. For collectors building a serious pallasite collection or a scientifically representative stony-iron suite, Gyarub Zangbo occupies a category that no other available specimen can fill. The backlit olivine quality in this lot is exceptional for a specimen of this age and exposure history.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Xizang, China, 2020 | Total known weight: 17.61kg | MB 110 (2022), revised MB 114 (2026)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45271296573487,"sku":"GYARUB-ZANGBO-45.91G-SLICE-EP","price":825.0,"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 Seymchan's structural identity as a coarse octahedrite, the classification it held prior to 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 originally classified as an IIE anomalous coarse octahedrite.\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 from an IIE anomalous coarse octahedrite to 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\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 established during Seymchan's original IIE octahedrite classification, 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","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":"nwa-18592-mesosiderite-meteorite-complete-individual-stony-iron-161-00g-remnant-fusion-crust","title":"NWA 18592 Mesosiderite Meteorite Complete Individual, Stony-Iron, 161.00g, Remnant Fusion Crust","description":"\u003ch2\u003eA complete individual mesosiderite with remnant fusion crust\u003c\/h2\u003e\u003cp\u003eNWA 18592 is a 161.00g complete individual \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003estony-iron meteorite\u003c\/a\u003e from the mesosiderite class, displaying remnant patches of black fusion crust against the weathered exterior. Mesosiderites are one of the rarest meteorite types known, comprising less than 0.3% of all classified falls and finds. This specimen was recovered in \u003ca href=\"\/pages\/nwa-meteorites-explained\"\u003eNorthwest Africa\u003c\/a\u003e, classified in 2026 by \u003cspan\u003eD. Sheikh\u003c\/span\u003e at Cascadia Meteorite Laboratory, and accepted by the Meteoritical Society in May 2026.\u003c\/p\u003e\u003cp\u003eThe complete individual form means this specimen retains its full atmospheric entry shape rather than being cut from a larger mass. The dark fusion crust, formed during the brief seconds when the meteorite blazed through Earth atmosphere, remains visible across portions of the surface. Mesosiderites are mixtures of roughly equal parts metallic iron-nickel and silicate rock, making them visually and structurally distinct from any other meteorite class.\u003c\/p\u003e\u003ch2\u003eStructure and features\u003c\/h2\u003e\u003cp\u003eMesosiderites display a brecciated texture in which metallic iron-nickel and silicate clasts are intermingled in roughly equal proportions. The silicate component of NWA 18592 contains low-calcium pyroxene clasts up to 1 millimeter, often with high-calcium pyroxene inclusions, along with lesser plagioclase feldspar. Accessory minerals include silica, merrillite, troilite, and chromite. The classification work documents moderate shock and moderate weathering throughout the specimen.\u003c\/p\u003e\u003cp\u003eThe metallic phase in this specimen has been substantially converted to iron hydroxide weathering products, common in mesosiderites recovered from desert finds. Patches of original fusion crust survive on portions of the exterior, dark and contrasting against the weathered surface. As a complete individual the specimen carries a distinctive sculpted exterior shape produced by ablation during atmospheric passage.\u003c\/p\u003e\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\u003cp\u003eNWA 18592 was recovered in Northwest Africa in 2024 and submitted for classification through Cascadia Meteorite Laboratory. The total known weight is 903 grams distributed across 11 stones, with the main mass held by Brian McDonald. A 24.6 gram type specimen is held at Cascadia. Classification was completed by D. Sheikh and accepted into the official record in May 2026, published in the Meteoritical Bulletin Database.\u003c\/p\u003e\u003cp\u003eGeochemical analysis confirmed mesosiderite classification with low-calcium pyroxene composition of Fs33.8 plus or minus 1.3 and Wo3.7 plus or minus 0.4, high-calcium pyroxene composition of Fs18.4 plus or minus 2.0 and Wo38.5 plus or minus 3.2, and plagioclase composition of An94.6 plus or minus 1.6. These compositional ranges are diagnostic of the mesosiderite parent body and distinguish this specimen from other stony-iron meteorites such as pallasites.\u003c\/p\u003e\u003ch2\u003eScientific context\u003c\/h2\u003e\u003cp\u003eMesosiderites represent one of the most puzzling meteorite classes known. Their formation requires the violent mixing of crustal silicates with molten metallic core material, a combination that is difficult to reconcile with standard models of asteroid differentiation. The leading hypothesis involves a catastrophic collision between a differentiated parent body and the metallic core of a smaller asteroid, with the resulting debris recombining under conditions that allowed both phases to coexist in roughly equal abundance.\u003c\/p\u003e\u003cp\u003eThe presence of low-calcium and high-calcium pyroxenes along with calcium-rich plagioclase places mesosiderites in the broader igneous achondrite family, sharing some compositional similarities with \u003ca href=\"\/collections\/hed-meteorites\"\u003eHED meteorites\u003c\/a\u003e believed to originate from Vesta. The high metal content separates mesosiderites from the achondrites and places them in the stony-iron meteorite group along with pallasites, though the two classes formed under very different conditions.\u003c\/p\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. NWA 18592 is an officially classified meteorite. See the \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=87168\" rel=\"noopener\" data-sanitized-target=\"_blank\" data-mce-href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=87168\"\u003eofficial Meteoritical Bulletin entry\u003c\/a\u003e. This specimen includes a Certificate of Authenticity issued by Treasure Coast Meteorite Co., IMCA #3323.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat makes a mesosiderite different from other stony-iron meteorites?\u003c\/strong\u003e Stony-iron meteorites come in two classes: \u003ca href=\"\/pages\/what-is-a-pallasite\"\u003epallasites\u003c\/a\u003e and mesosiderites. Pallasites contain olivine crystals embedded in iron-nickel metal and formed at the core-mantle boundary of a differentiated asteroid. Mesosiderites contain brecciated silicate clasts mixed with metal in roughly equal proportions and formed through catastrophic impact mixing. They are visually and texturally distinct.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is fusion crust and why does it matter?\u003c\/strong\u003e Fusion crust is the dark glassy coating produced when a meteorite passes through Earth atmosphere at hypersonic velocity. The outer layer of the stone briefly melts and then solidifies as the meteorite slows below ablation speed. Surviving fusion crust is a key authentication feature and is more commonly preserved on complete individuals than on cut specimens.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does complete individual mean?\u003c\/strong\u003e A complete individual is a meteorite that has not been cut, sliced, or fragmented since recovery. It retains its full atmospheric entry shape, including any fusion crust, oriented features, and regmaglypts. Complete individuals are generally more desirable to collectors than cut fragments of equal weight because they preserve the natural form of the specimen.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e The specimen pictured plus a printed Certificate of Authenticity. The COA documents the official classification, weight, and provenance through Treasure Coast Meteorite Co., IMCA member #3323.\u003c\/p\u003e\u003ch2\u003eCollector significance\u003c\/h2\u003e\u003cp\u003eMesosiderites are among the rarest meteorite classes, comprising fewer than 250 distinct classifications worldwide and representing less than 0.3% of the entire meteorite catalog. NWA 18592 was newly classified in 2026 with a modest 903 gram total known weight distributed across 11 stones, which places it among the smaller mesosiderite finds and increases the relative importance of each surviving piece. The complete individual form with surviving fusion crust makes this specimen particularly desirable for collectors building a representative stony-iron section.\u003c\/p\u003e\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=87168\" rel=\"noopener\" data-sanitized-target=\"_blank\" data-mce-href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=87168\"\u003e903g TKW | MB 115 (2026)\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr data-mce-bogus=\"1\"\u003e\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45377993670703,"sku":null,"price":805.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/NWA-18592-Mesosiderite-161g-Hero-White.jpg?v=1779408328"},{"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\u003eTranslucent olivine in an ungrouped pallasite from a distinct parent body\u003c\/h2\u003e\n\u003cp\u003eThis slice of Gyarub Zangbo is not a typical pallasite. Geochemical analysis of its olivine and metallic phases, combined with oxygen and chromium isotope data, confirms that Gyarub Zangbo originated from a parent body distinct from all other known pallasites. It is classified as an ungrouped pallasite, a designation confirmed by the Meteoritical Society in MB 114 (April 2026) that places it outside all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eBacklight this 86.11g slice and the olivine crystals come alive, transitioning from deep olive-green into warm amber and orange tones. A portion of the crystals still hold genuine translucency in spite of the terrestrial weathering that has turned much of the olivine toward brown and black hues. Between the crystals, the metallic matrix carries the polished sheen of iron-nickel alloy, and the Widmanstatten pattern is visible in the etched zones near the metal margins. Both faces of this slice are sealed with a thin protective epoxy coating that preserves the olivine and slows continued oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo's olivine fayalite content is Fa21.6-22.8 mol%, slightly higher than typical main group pallasites and consistent with its ungrouped status. The metallic component contains approximately 15.8% nickel, also elevated relative to most main group pallasites, and trace amounts of cobalt, copper, and germanium that further distinguish it from the PMG parent body.\u003c\/p\u003e\n\u003cp\u003eAcross this 86.11g specimen, the olivine grains span a wide size range, from sub-millimeter inclusions to clusters approaching a centimeter, scattered unevenly through the polished face. One side of the slice carries more concentrated crystal clusters while the opposite side opens into broader iron-nickel matrix zones. A natural unpolished edge runs along part of the perimeter, retaining the original weathered crust of the parent stone and recording its long surface exposure on the Tibetan plateau.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was discovered in October 2020 by Mr. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo River in Tibet, China. The find comprised disaggregated olivine and metal fragments scattered across the surface, along with a larger metal-rich mass nearby. The total recovered weight was approximately 17.6 kilograms, making Gyarub Zangbo one of the rarest pallasites available to collectors by total known weight.\u003c\/p\u003e\n\u003cp\u003eThe remote plateau environment preserved the specimens from human disturbance while subjecting them to high-altitude weathering. The result is a pallasite with significant surface oxidation on natural faces but excellent interior preservation where the polished slice reveals the original olivine-metal structure. 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\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe ungrouped classification of Gyarub Zangbo is its most scientifically significant attribute. Main group pallasites, the most common type, including Sericho, Esquel, and Brenham,  share a common parent body linked to the IIIAB iron meteorite group. Gyarub Zangbo does not. Its oxygen isotopic signatures plot along an array between PMG and Eagle Station pallasite values but do not overlap with any other known ungrouped pallasites. The metal composition shows affinity with IIF irons rather than the IIIAB irons linked to the main group, and nickel content is elevated above both Eagle Station and PMG values. These data collectively confirm a parent body distinct from all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eThis makes Gyarub Zangbo a window into a differentiated parent body not represented by any other pallasite in collections. The reclassification to ungrouped in MB 114 (revised April 2026) reflects the current official classification. A 2023 paper by Jiang et al. presented at the 54th Lunar and Planetary Science Conference proposed that Gyarub Zangbo may have carbonaceous origins consistent with formation beyond Jupiter's orbit, based on its oxygen isotope array and olivine chemistry. While this interpretation has not been incorporated into the official Meteoritical Bulletin classification, it represents active scientific inquiry that adds a layer of interest few other pallasites can claim. Browse our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e for related specimens.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially classified meteorite. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Gyarub Zangbo\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\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Most pallasites belong to the main group (PMG) and share a single parent body. Gyarub Zangbo is classified as ungrouped (confirmed in MB 114, April 2026) because its olivine chemistry, nickel content, and oxygen isotope ratios do not match the PMG, Eagle Station group, or any other established pallasite group. Its metal shows affinity with IIF irons rather than IIIAB, placing its parent body outside the known pallasite family tree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when held to light?\u003c\/strong\u003e Fresh pallasite olivine is transparent to translucent, and many crystals in this specimen retain enough translucency to transmit light. The amber and orange glow visible when the slice is backlit is the natural color of the olivine itself, the same mineral as the gemstone peridot. Terrestrial weathering gradually makes olivine opaque, but Gyarub Zangbo's relatively recent discovery means many crystals preserve this optical quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e The thin epoxy applied to both faces stabilizes the olivine crystals and slows further terrestrialization, the oxidation process that gradually darkens and opacifies the olivine. It does not affect the visual quality of the specimen and is standard practice for pallasite preservation.\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. This slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 17.6 kilograms total known weight, Gyarub Zangbo is among the rarest pallasites by total mass, rarer than Fukang, rarer than most named pallasites in collector circulation. Its anomalous classification adds scientific significance beyond simple rarity: this is a meteorite from a parent body not represented by any other known specimen. For collectors building a serious pallasite collection or a scientifically representative stony-iron suite, Gyarub Zangbo occupies a category that no other available specimen can fill. The backlit olivine quality in this lot is exceptional for a specimen of this age and exposure history.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Xizang, China, 2020 | Total known weight: 17.61kg | MB 110 (2022), revised MB 114 (2026)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","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":true}],"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\u003eBacklit translucent olivine in a rare ungrouped Tibetan pallasite\u003c\/h2\u003e\n\u003cp\u003eThis slice of Gyarub Zangbo is not a typical pallasite. Geochemical analysis of its olivine and metallic phases, combined with oxygen and chromium isotope data, confirms that Gyarub Zangbo originated from a parent body distinct from all other known pallasites. It is classified as an ungrouped pallasite, a designation confirmed by the Meteoritical Society in MB 114 (April 2026) that places it outside all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eWhen this 74.92g slice is held to a light source, sections of the olivine come alive in warm amber and honey tones, while neighboring crystals stay dark olive-green or nearly black from terrestrial weathering. The contrast between the two states is striking. Polished iron-nickel metal flows between the crystals with a soft mirror finish, and the Widmanstatten structure is visible where etching reaches the metal margins. A thin protective epoxy coating sealed on both faces keeps the olivine stable and limits ongoing oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo's olivine fayalite content is Fa21.6-22.8 mol%, slightly higher than typical main group pallasites and consistent with its ungrouped status. The metallic component contains approximately 15.8% nickel, also elevated relative to most main group pallasites, and trace amounts of cobalt, copper, and germanium that further distinguish it from the PMG parent body.\u003c\/p\u003e\n\u003cp\u003eOlivine grains in this 74.92g slice range from fine sub-millimeter inclusions up to centimeter-scale aggregates, spread irregularly through the polished face. Concentrated crystal-rich zones sit next to broader stretches of exposed iron-nickel metal, creating a varied internal pattern across the slice. Along part of the perimeter, an unpolished natural edge preserves the weathered crust of the original stone, with surface oxidation that records its long exposure on the Qinghai-Tibet Plateau.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was discovered in October 2020 by Mr. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo River in Tibet, China. The find comprised disaggregated olivine and metal fragments scattered across the surface, along with a larger metal-rich mass nearby. The total recovered weight was approximately 17.6 kilograms, making Gyarub Zangbo one of the rarest pallasites available to collectors by total known weight.\u003c\/p\u003e\n\u003cp\u003eThe remote plateau environment preserved the specimens from human disturbance while subjecting them to high-altitude weathering. The result is a pallasite with significant surface oxidation on natural faces but excellent interior preservation where the polished slice reveals the original olivine-metal structure. 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\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe ungrouped classification of Gyarub Zangbo is its most scientifically significant attribute. Main group pallasites, the most common type, including Sericho, Esquel, and Brenham,  share a common parent body linked to the IIIAB iron meteorite group. Gyarub Zangbo does not. Its oxygen isotopic signatures plot along an array between PMG and Eagle Station pallasite values but do not overlap with any other known ungrouped pallasites. The metal composition shows affinity with IIF irons rather than the IIIAB irons linked to the main group, and nickel content is elevated above both Eagle Station and PMG values. These data collectively confirm a parent body distinct from all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eThis makes Gyarub Zangbo a window into a differentiated parent body not represented by any other pallasite in collections. The reclassification to ungrouped in MB 114 (revised April 2026) reflects the current official classification. A 2023 paper by Jiang et al. presented at the 54th Lunar and Planetary Science Conference proposed that Gyarub Zangbo may have carbonaceous origins consistent with formation beyond Jupiter's orbit, based on its oxygen isotope array and olivine chemistry. While this interpretation has not been incorporated into the official Meteoritical Bulletin classification, it represents active scientific inquiry that adds a layer of interest few other pallasites can claim. Browse our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e for related specimens.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially classified meteorite. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Gyarub Zangbo\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\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Most pallasites belong to the main group (PMG) and share a single parent body. Gyarub Zangbo is classified as ungrouped (confirmed in MB 114, April 2026) because its olivine chemistry, nickel content, and oxygen isotope ratios do not match the PMG, Eagle Station group, or any other established pallasite group. Its metal shows affinity with IIF irons rather than IIIAB, placing its parent body outside the known pallasite family tree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when held to light?\u003c\/strong\u003e Fresh pallasite olivine is transparent to translucent, and many crystals in this specimen retain enough translucency to transmit light. The amber and orange glow visible when the slice is backlit is the natural color of the olivine itself, the same mineral as the gemstone peridot. Terrestrial weathering gradually makes olivine opaque, but Gyarub Zangbo's relatively recent discovery means many crystals preserve this optical quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e The thin epoxy applied to both faces stabilizes the olivine crystals and slows further terrestrialization, the oxidation process that gradually darkens and opacifies the olivine. It does not affect the visual quality of the specimen and is standard practice for pallasite preservation.\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. This slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 17.6 kilograms total known weight, Gyarub Zangbo is among the rarest pallasites by total mass, rarer than Fukang, rarer than most named pallasites in collector circulation. Its anomalous classification adds scientific significance beyond simple rarity: this is a meteorite from a parent body not represented by any other known specimen. For collectors building a serious pallasite collection or a scientifically representative stony-iron suite, Gyarub Zangbo occupies a category that no other available specimen can fill. The backlit olivine quality in this lot is exceptional for a specimen of this age and exposure history.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Xizang, China, 2020 | Total known weight: 17.61kg | MB 110 (2022), revised MB 114 (2026)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","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":true}],"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\u003eHoney-toned olivine and mirrored metal in an ungrouped Tibetan pallasite\u003c\/h2\u003e\n\u003cp\u003eThis slice of Gyarub Zangbo is not a typical pallasite. Geochemical analysis of its olivine and metallic phases, combined with oxygen and chromium isotope data, confirms that Gyarub Zangbo originated from a parent body distinct from all other known pallasites. It is classified as an ungrouped pallasite, a designation confirmed by the Meteoritical Society in MB 114 (April 2026) that places it outside all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eHold this 76.62g specimen up to bright light and you see two faces of the same crystal field at once: clusters that glow with rich amber and honey light, and adjacent grains that remain a deep olive-green or near-black where terrestrial weathering took hold. Polished iron-nickel matrix wraps each crystal with a soft mirrored surface, and the etched Widmanstatten pattern emerges along the broader metal sections. A thin epoxy sealant applied to both polished faces keeps the olivine stable and limits ongoing oxidation.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo's olivine fayalite content is Fa21.6-22.8 mol%, slightly higher than typical main group pallasites and consistent with its ungrouped status. The metallic component contains approximately 15.8% nickel, also elevated relative to most main group pallasites, and trace amounts of cobalt, copper, and germanium that further distinguish it from the PMG parent body.\u003c\/p\u003e\n\u003cp\u003eThe olivine in this 76.62g slice ranges from tiny sub-millimeter specks to larger centimeter-scale clusters, distributed unevenly across the polished surface. Dense crystal pockets give way to wide expanses of mirrored iron-nickel metal, producing a textured internal landscape unique to this specimen. A portion of the perimeter retains its unpolished natural exterior, with oxidized crust that documents the long terrestrial weathering history this pallasite endured on the Qinghai-Tibet Plateau.\u003c\/p\u003e\n\u003ch2\u003eDiscovery and provenance\u003c\/h2\u003e\n\u003cp\u003eGyarub Zangbo was discovered in October 2020 by Mr. Tulga during exploration of the uninhabited Qiangtang region of the Qinghai-Tibet Plateau, northeast of the Gyarub Zangbo River in Tibet, China. The find comprised disaggregated olivine and metal fragments scattered across the surface, along with a larger metal-rich mass nearby. The total recovered weight was approximately 17.6 kilograms, making Gyarub Zangbo one of the rarest pallasites available to collectors by total known weight.\u003c\/p\u003e\n\u003cp\u003eThe remote plateau environment preserved the specimens from human disturbance while subjecting them to high-altitude weathering. The result is a pallasite with significant surface oxidation on natural faces but excellent interior preservation where the polished slice reveals the original olivine-metal structure. 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\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eThe ungrouped classification of Gyarub Zangbo is its most scientifically significant attribute. Main group pallasites, the most common type, including Sericho, Esquel, and Brenham,  share a common parent body linked to the IIIAB iron meteorite group. Gyarub Zangbo does not. Its oxygen isotopic signatures plot along an array between PMG and Eagle Station pallasite values but do not overlap with any other known ungrouped pallasites. The metal composition shows affinity with IIF irons rather than the IIIAB irons linked to the main group, and nickel content is elevated above both Eagle Station and PMG values. These data collectively confirm a parent body distinct from all established pallasite groups.\u003c\/p\u003e\n\u003cp\u003eThis makes Gyarub Zangbo a window into a differentiated parent body not represented by any other pallasite in collections. The reclassification to ungrouped in MB 114 (revised April 2026) reflects the current official classification. A 2023 paper by Jiang et al. presented at the 54th Lunar and Planetary Science Conference proposed that Gyarub Zangbo may have carbonaceous origins consistent with formation beyond Jupiter's orbit, based on its oxygen isotope array and olivine chemistry. While this interpretation has not been incorporated into the official Meteoritical Bulletin classification, it represents active scientific inquiry that adds a layer of interest few other pallasites can claim. Browse our \u003ca href=\"\/collections\/stony-iron-meteorites\"\u003eStony-Iron Meteorites collection\u003c\/a\u003e for related specimens.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Gyarub Zangbo is an officially classified meteorite. See the \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eofficial Meteoritical Bulletin entry for Gyarub Zangbo\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\u003eWhat makes Gyarub Zangbo different from other pallasites?\u003c\/strong\u003e Most pallasites belong to the main group (PMG) and share a single parent body. Gyarub Zangbo is classified as ungrouped (confirmed in MB 114, April 2026) because its olivine chemistry, nickel content, and oxygen isotope ratios do not match the PMG, Eagle Station group, or any other established pallasite group. Its metal shows affinity with IIF irons rather than IIIAB, placing its parent body outside the known pallasite family tree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the olivine glow when held to light?\u003c\/strong\u003e Fresh pallasite olivine is transparent to translucent, and many crystals in this specimen retain enough translucency to transmit light. The amber and orange glow visible when the slice is backlit is the natural color of the olivine itself, the same mineral as the gemstone peridot. Terrestrial weathering gradually makes olivine opaque, but Gyarub Zangbo's relatively recent discovery means many crystals preserve this optical quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the epoxy coating do?\u003c\/strong\u003e The thin epoxy applied to both faces stabilizes the olivine crystals and slows further terrestrialization, the oxidation process that gradually darkens and opacifies the olivine. It does not affect the visual quality of the specimen and is standard practice for pallasite preservation.\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. This slice carries a thin protective epoxy coating on both faces.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eAt 17.6 kilograms total known weight, Gyarub Zangbo is among the rarest pallasites by total mass, rarer than Fukang, rarer than most named pallasites in collector circulation. Its anomalous classification adds scientific significance beyond simple rarity: this is a meteorite from a parent body not represented by any other known specimen. For collectors building a serious pallasite collection or a scientifically representative stony-iron suite, Gyarub Zangbo occupies a category that no other available specimen can fill. The backlit olivine quality in this lot is exceptional for a specimen of this age and exposure history.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.cfm?code=73792\" target=\"_blank\"\u003eGyarub Zangbo\u003c\/a\u003e | Classification: Pallasite (ungrouped) | Find, Xizang, China, 2020 | Total known weight: 17.61kg | MB 110 (2022), revised MB 114 (2026)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.tcmeteorites.com\/pages\/gyarub-zangbo-pallasite-the-outer-solar-system-meteorite-found-in-tibet\"\u003eLearn more about Gyarub Zangbo: origin, classification, and science\u003c\/a\u003e\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":45383409664047,"sku":"GYARUB-ZANGBO-76.62G-SLICE-EP","price":1380.0,"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"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/collections\/stony-iron-meteorites-collection.png?v=1766196310","url":"https:\/\/www.tcmeteorites.com\/collections\/stony-iron-meteorites.oembed","provider":"Treasure Coast Meteorite Co.","version":"1.0","type":"link"}