NWA XXX Unclassified Ordinary Chondrite Meteorite Individual, 313.16g, Oriented with Fusion Crust Window

Oriented atmospheric entry preserved in fusion crust

This 313.16g ordinary chondrite preserves the complete thermal signature of controlled atmospheric flight. The specimen's orientation is visible in the asymmetric fusion crust patterns, with thicker ablation on the leading surface and flow lines radiating toward the trailing edge. A precision-cut polished window exposes the internal chondritic matrix without compromising the exterior crust integrity.

The fusion crust retains its original black luster with minimal weathering -- characteristic of fresh finds in the hyperarid Western Sahara environment. Surface regmaglypts show shallow development, consistent with a relatively brief atmospheric passage before deceleration and fall.

Structure and features

The polished window reveals a light gray matrix densely packed with chondrules ranging from submillimeter to 2mm in diameter. Metal grains distributed throughout the groundmass reflect light under direct illumination. The chondrule population displays variable textures, with both well-defined spherical forms and irregularly shaped objects visible in cross-section.

Fusion crust thickness varies from 0.3mm on the trailing surface to approximately 0.8mm at the apex of orientation, documenting differential heating during descent. The crust-matrix boundary shows sharp contact with no infiltration or secondary alteration. No shock veining or brecciation is apparent in the exposed interior.

Scientific context

Ordinary chondrites constitute approximately 87% of observed meteorite falls, making them our most abundant samples of early solar system material. These meteorites formed 4.56 billion years ago in the asteroid belt from dust and millimeter-sized chondrules that accreted before planetary differentiation occurred. The chondrules themselves are older still -- melt droplets that froze in the solar nebula before asteroids assembled.

Unclassified specimens await formal petrographic analysis to determine their specific group (H, L, or LL) and petrologic type (3-6). Classification requires thin-section analysis of olivine and pyroxene compositions, along with metal content measurements. Despite lacking formal classification, the specimen's texture and appearance place it confidently within the ordinary chondrite family. Collectors interested in the fundamentals of meteorite science will find comprehensive information at Learn About Meteorites.

Frequently asked questions

Is this meteorite authenticated? This specimen is identified as an unclassified ordinary chondrite based on diagnostic features including chondrule-rich matrix, metal distribution, and fusion crust characteristics. While formal Meteoritical Bulletin classification is pending, the meteorite displays all structural markers of the ordinary chondrite group. A certificate of authenticity documenting provenance and physical characteristics is included with purchase.

What does "oriented" mean for a meteorite? Orientation indicates the specimen maintained stable flight attitude during atmospheric entry, with one surface consistently facing forward. This produces asymmetric fusion crust with thicker ablation on the leading edge and distinctive flow patterns. Oriented specimens are significantly less common than tumbling meteorites, which develop uniform fusion crust on all surfaces.

Why is the fusion crust "fresh" on this specimen? Fresh fusion crust retains its original black color and glassy texture without oxidation or weathering. This specimen's 2024 find date in the Western Sahara's arid climate allowed minimal terrestrial alteration. Contrast this with older finds where crust turns brown or flakes away after decades of weathering.

What is included with this specimen? The specimen weighs 313.16g with complete fusion crust and polished window. Certificate of authenticity included. No display stand is provided with this listing.

Collector significance

Complete fusion crust coverage is uncommon in recovered meteorites. Most specimens fracture on impact or weather extensively before collection. This individual retains its entire atmospheric skin while providing interior access through a carefully positioned window -- offering both display appeal and scientific visibility without destructive sampling.

The oriented geometry adds scarcity value. While ordinary chondrites fall frequently, the subset showing clear orientation represents a fraction of recovered material. The 313.16g mass provides substantial presence for display while remaining accessible for private collections. Collectors building representative Chondrites assemblages will find this specimen delivers both visual impact and pedagogical value for understanding atmospheric entry processes.

Recent recovery date ensures this material entered collections with minimal handling history. For collectors interested in fresh, unweathered specimens from recent Saharan recoveries, this individual offers condition quality rarely seen in older cataloged falls.