NWA 16975 LL3 Ordinary Chondrite Meteorite End Cut, 68.00g, Primitive Chondrules in Riker Case

Primitive solar system material in transparent display

This 68-gram end cut from NWA 16975 showcases the defining characteristics of LL3 ordinary chondrites: discrete spherical chondrules embedded in primitive matrix material. The end cut format exposes both interior structure and exterior features in a single cross-section, while the Riker case provides unobstructed viewing access from all angles without handling the specimen. The low iron content typical of LL-group chondrites creates subtle color variations across the cut surface, with individual chondrules standing out against the darker matrix.

End cuts from the outer portion of a meteorite body often preserve contact zones where fusion crust transitions into unmelted interior material. This specimen captures that boundary, documenting the thermal gradient experienced during atmospheric entry. The transparent Riker case eliminates the need for protective handling while maintaining visual clarity for examination of textural details.

Chondrules and primitive texture

LL3 chondrites preserve chondrules with sharp boundaries and minimal recrystallization. Individual chondrules remain distinct rather than blending into the surrounding matrix, a characteristic lost at higher petrologic types. The matrix retains fine-grained material that has not been altered by heat or pressure since accretion 4.56 billion years ago. Metallic grains appear as small, dispersed flecks rather than concentrated masses.

The LL designation indicates low total iron content and low metal content relative to other ordinary chondrite groups. This composition produces specimens with less metallic luster than H or L chondrites, but with correspondingly better preservation of silicate minerals in their original state. Chondrule sizes vary across the cut surface, ranging from submillimeter to several millimeters in diameter.

Scientific context

Type 3 chondrites occupy the lowest metamorphic grade in the petrologic classification system, meaning they experienced minimal heating after formation. This preservation makes them scientifically valuable for studying conditions in the early solar nebula. LL chondrites likely originated from a parent body in the main asteroid belt between Mars and Jupiter, where temperatures remained low enough to prevent thermal alteration of primary minerals and textures.

The NWA 16975 strewnfield in Algeria yielded multiple specimens in 2024, all classified as LL3 ordinary chondrites. This classification places them among approximately 8% of all ordinary chondrite falls, as LL-group meteorites are less common than H or L types. For more information about chondrite classifications and parent bodies, see our Learn About Meteorites guide.

Frequently asked questions

Is this meteorite authenticated? NWA 16975 is classified in the Meteoritical Bulletin as an LL3 ordinary chondrite found in Algeria in 2024. View the official record: Meteoritical Bulletin entry. This specimen includes a certificate of authenticity documenting its classification and provenance.

What does the "3" in LL3 mean? The number indicates petrologic type, which measures the degree of thermal metamorphism experienced by the meteorite. Type 3 is the lowest metamorphic grade, preserving primitive features like well-defined chondrules and unaltered matrix. Higher numbers (4, 5, 6) indicate progressively more heat alteration.

What is included with this specimen? You receive the 68.00g NWA 16975 end cut meteorite in a Riker presentation case with transparent lid, plus a certificate of authenticity. The case provides display protection without requiring glass or additional framing.

Why are end cuts significant for collectors? End cuts reveal both interior and exterior features in a single piece, showing the transition from fusion crust to unmelted interior. This cross-sectional view documents atmospheric heating effects while exposing internal structure, providing more geological information than either a complete exterior or a pure interior slice.

Type 3 chondrites for serious collections

Collectors prioritize type 3 chondrites for their scientific value and visual character. The preservation of distinct chondrules creates textural interest absent in more metamorphosed types, where recrystallization obscures original structures. LL-group specimens add diversity to collections dominated by more common H and L chondrites. At 68 grams, this end cut provides substantial material for study or display without premium pricing associated with larger masses.

The Riker case format offers immediate display capability. The specimen sits securely in cotton batting under a transparent lid, eliminating handling risks while maintaining full visibility. This presentation works for both desktop display and wall mounting. Browse additional primitive chondrite specimens in our Chondrites collection.

Meteoritical Bulletin entry: NWA 16975 | Classification: LL3 | Find, Algeria, 2024