NWA 7831 Diogenite Meteorite Specimen Official HED Achondrite Northwest Africa Meteorite

An authentic specimen of the officially classified Northwest Africa 7831 (NWA 7831) meteorite, a rare Diogenite achondrite approved in Meteoritical Bulletin 103 in 2014. Recovered in Western Sahara in 2013, this remarkable meteorite is especially prized for its striking translucent yellow-green orthopyroxene-rich composition and highly crystalline appearance.

NWA 7831 represents one of the more visually distinctive diogenites known, consisting almost entirely of coarse orthopyroxene crystals with sparse accessory minerals distributed throughout the stone. The meteorite's unusual crystal-rich structure and coloration make it highly sought after among advanced meteorite and mineral collectors alike.

Official Classification

• Name: Northwest Africa 7831 (NWA 7831)
• Country: Western Sahara
• Year Found: 2013
• Classification: HED Achondrite (Diogenite)
• Shock Stage: Low
• Weathering Grade: Moderate
• Total Known Weight: Approximately 20 kg
• Official Publication: Meteoritical Bulletin 103

Physical Characteristics

Official reports describe: yellow-green crystalline structure, translucent orthopyroxene-rich composition, pale orange weathering products along fractures, highly fractured but coarse-grained material, and sparse accessory mineral inclusions.

Scientific Composition

Scientific analysis identified: orthopyroxene dominant composition, chromite, troilite, anorthite, silica polymorphs, clinopyroxene, and sparse Ni-free metal grains.

The stone was reportedly found buried near Chouichiyat in Western Sahara and excavated by local finders in 2013. Due to extensive fracturing, portions of the material reportedly disintegrated during excavation, making intact high-quality specimens especially desirable.

Unlike ordinary chondrites, diogenites are achondritic meteorites composed primarily of igneous orthopyroxene-rich material and are highly valued for their crystalline textures and differentiated mineralogy.

Ideal For

• Diogenite collectors
• HED achondrite enthusiasts
• Advanced meteorite collections
• Mineral-meteorite crossover collectors
• Museum and educational displays
• Collectors seeking visually unique achondrites

Depending on preparation, specimens may display: translucent crystalline orthopyroxene, greenish-yellow coloration, coarse mineral textures, polished pyroxene structure, and chromite inclusions and fracture networks.

A remarkable extraterrestrial artifact showcasing one of the most visually unusual crystalline structures found within rare achondrite meteorites.

Measurements & Weight

• Dimensions: 40 x 35 x 0.2 mm
• Weight: 6.2g

Condition

Please review all photos carefully for overall condition, fractures, weathering, crystal structure, and preparation characteristics, as they are considered part of the description. Meteorites are natural extraterrestrial objects and commonly display fractures, oxidation, weathering products, and natural mineralogical variation.