NWA 17496 L3 Chondrite Meteorite End Cut, 21.75g, Riker Display Case, Primitive Unequilibrated

Primitive solar system material in display-ready format

This 21.75g polished end cut from NWA 17496 exposes the internal architecture of an L3 ordinary chondrite recovered from Algeria in 2024. The polished surface reveals well-preserved chondrules suspended in a fine-grained matrix, documenting conditions in the early solar nebula before planetary differentiation began. The end cut geometry provides a cross-sectional view through the meteorite's structure while preserving the natural exterior along the specimen's edges.

The included riker display case positions this specimen for immediate presentation without requiring additional mounting hardware. The shallow case depth and transparent cover protect the polished surface while maintaining visual access to the chondrule distribution and matrix textures that characterize primitive chondritic material.

Chondrule preservation and matrix structure

The polished face displays individual chondrules ranging from sub-millimeter to several millimeters in diameter, each representing a discrete melting event in the solar nebula 4.567 billion years ago. The Type 3 classification confirms these spherules retain their original compositions and boundaries without the thermal metamorphism that would homogenize their chemistry in higher petrologic types.

The matrix surrounding the chondrules consists of fine-grained silicate minerals, metal grains, and sulfides that accreted in the cooler regions of the protoplanetary disk. This unequilibrated texture preserves chemical and mineralogical gradients that were erased in more thermally processed meteorites, making L3 chondrites valuable records of nebular conditions before parent body assembly.

Scientific context

L chondrites formed in the asteroid belt from material that accreted before planets completed their growth. The "L" designation indicates low total iron content (19-22% by mass) compared to H and LL chondrite groups, reflecting formation in a region of the nebula with reduced metal abundance. Type 3 specimens like NWA 17496 experienced minimal heating after accretion, preserving original textures that were destroyed in chondrites that underwent parent body metamorphism.

The preservation of distinct chondrules and unequilibrated mineral compositions makes Type 3 chondrites critical for understanding nebular processes. These specimens retain isotopic and chemical heterogeneities present in the earliest solid materials, providing constraints on the temperature, pressure, and timescales of dust aggregation in the protoplanetary disk. Learn About Meteorites for additional context on chondrite formation and classification.

Frequently asked questions

Is this meteorite authenticated? NWA 17496 is classified in the Meteoritical Bulletin as an L3 ordinary chondrite. You can verify this classification through the Meteoritical Bulletin database. This specimen includes a certificate of authenticity documenting its classification and provenance.

What does "unequilibrated" mean for Type 3 chondrites? Unequilibrated indicates the meteorite never experienced temperatures high enough to homogenize the chemical compositions of its minerals. Individual chondrules retain distinct compositions, and olivine grains show variable iron-magnesium ratios rather than the uniform chemistry seen in equilibrated (Type 4-6) chondrites. This preservation of original chemical gradients makes Type 3 specimens valuable for studying nebular conditions.

What is included with this specimen? You receive the 21.75g polished end cut presented in a protective riker display case and a certificate of authenticity confirming the classification and specimen details.

How does the L group differ from H and LL chondrites? The L (low iron) group contains 19-22% total iron by mass, intermediate between the H (high iron, 25-31%) and LL (low iron, low metal, 10-19%) groups. This iron content reflects the oxidation state and metal abundance in the nebular region where L chondrite parent bodies formed, approximately 2.8 AU from the sun based on orbital mechanics of recovered L chondrite falls.

Display-ready specimen for collectors and educators

The polished end cut format optimizes visibility of internal structures while the riker case provides immediate display capability without additional preparation. The 21.75g mass represents a size that clearly shows chondrule distribution and matrix textures without requiring magnification for initial examination, though detailed inspection reveals additional fine-scale features.

Type 3 chondrites occupy a specific position in collections focused on primitive materials or systematic representations of chondrite petrologic types. The unequilibrated nature of this specimen contrasts with the metamorphosed textures of higher-type ordinary chondrites, illustrating the range of thermal histories experienced by asteroidal parent bodies. Browse additional primitive specimens in our Chondrites collection.

Meteoritical Bulletin entry: NWA 17496 | Classification: L3 Ordinary Chondrite | Find, Algeria, 2024