NWA XXX Ordinary Chondrite Meteorite Individual, Unclassified, 1091.71g, Oriented with Regmaglypts

Oriented atmospheric flight preserved in stone

This 1091.71g complete individual preserves the exact orientation it maintained during atmospheric entry. The leading surface displays a smooth, ablated profile where atmospheric friction was most intense, while the trailing surface retains a rougher texture with pronounced regmaglypts—thumbprint-like depressions formed by turbulent airflow during descent. The aerodynamic shaping documents a stable, controlled fall through the atmosphere rather than the tumbling flight pattern that produces unoriented stones.

Fresh, glossy fusion crust coats the exterior with minimal terrestrial weathering, indicating recent recovery from the Sahara. A cut window on one side exposes the internal chondritic structure, revealing the primitive aggregation of chondrules and mineral grains that define ordinary chondrites. This combination of preserved exterior features and accessible interior makes the specimen both scientifically informative and visually compelling.

Regmaglypts and fusion crust formation

The regmaglypts across the trailing surface formed as differential ablation sculpted the stone during its hypersonic descent. Areas of slightly lower density or different mineral composition ablated faster, creating the characteristic thumbprint depressions. The depth and definition of these features indicate the specimen experienced significant heating without complete ablation—a balance that requires specific entry angles and velocities.

The fusion crust itself represents a glassy rind formed when surface material melted and immediately resolidified in the frigid upper atmosphere. The glossy black coating is thickest on the leading surface where heating was most intense, thinning toward the trailing edge. Small flow lines visible in the crust record the direction of airflow, providing additional evidence of the stone's orientation during flight.

Scientific context

Ordinary chondrites represent the most common meteorite type, accounting for approximately 80% of all observed falls. These stones formed in the early solar nebula 4.567 billion years ago, aggregating from dust, chondrules, and other primitive components before the planets finished forming. Their parent bodies—likely asteroids in the main belt between Mars and Jupiter—preserve conditions from the solar system's first few million years. Learn About Meteorites to understand how these primitive stones inform planetary science.

The unclassified status means this specimen has not yet undergone formal petrologic and chemical analysis to determine its specific H, L, or LL group assignment and petrologic type. Future classification work may provide additional scientific value, particularly if it represents an undersampled group or fall event.

Frequently asked questions

Is this meteorite authenticated? This specimen is sold as an unclassified ordinary chondrite based on its chondritic texture, fusion crust, and field characteristics consistent with meteoritic origin. While not formally classified in the Meteoritical Bulletin, it includes a certificate of authenticity from Treasure Coast Meteorite Co. documenting its meteoritic nature, weight, and provenance.

What does oriented mean for a meteorite? An oriented meteorite maintained a stable orientation during atmospheric entry rather than tumbling. This produces distinct leading and trailing surfaces with different ablation patterns, regmaglypts, and fusion crust characteristics. Oriented specimens are scientifically valuable because they preserve flight dynamics data and are highly sought by collectors for their aerodynamic shaping.

Why is this specimen unclassified? Formal classification requires thin section preparation, petrographic analysis, and often chemical or isotopic testing performed by a qualified meteoriticist. Many Northwest Africa finds remain unclassified due to the volume of material recovered and limited analytical resources. Unclassified specimens are sold based on field characteristics and texture consistent with known meteorite types.

What is included with this specimen? The specimen weighs 1091.71g and includes a certificate of authenticity. No display stand is included unless separately noted.

Can this meteorite be formally classified in the future? Yes. The cut window provides access to fresh interior material suitable for thin section preparation. Owners may submit samples to a qualified laboratory for formal classification, though this requires destructive sampling and laboratory fees.

Display and collecting value

Oriented meteorites comprise less than 2% of witnessed falls and an even smaller fraction of finds, making specimens with clear flight orientation highly collectible. This individual's size—over one kilogram—provides substantial visual impact while the regmaglypts, fusion crust, and aerodynamic profile tell a clear story of atmospheric passage. The cut window adds educational value without compromising the specimen's oriented character.

Fresh fusion crust and minimal weathering enhance both scientific and aesthetic value. The glossy black coating contrasts sharply with the lighter interior visible through the window, creating visual interest from multiple viewing angles. Collectors seeking Chondrites or Budget Friendly Pieces will find this specimen offers significant mass and compelling features at accessible pricing for a kilogram-class oriented stone.