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NWA 6933 (Sahara) – Eucrite

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Northwest Africa 6933 (NWA 6933)

(Northwest Africa)

Purchased: 2010

Classification: HED achondrite (Eucrite)

Petrography: (K. Metzler, IfP) Coarse-grained eucritic clasts with ophitic to subophitic textures and mineral fragments (pyroxene, plagioclase, silica polymorph) set in a dark gray matrix. The matrix represents a crystallized melt with subophitic texture consisting of pyroxene and skeletal plagioclase crystals. Lithic clasts and mineral fragments are strongly recrystallized. Some pyroxene fragments contain Fe-rich olivine veins. Accessories are ilmenite, troilite, and metal (mostly oxidized). Calcite veins occur.

Geochemistry: Plagioclase compositions: An 89.1±2.0 (85-93; n=15). Olivine veins: Fa75.

Classification: Eucritic melt rock

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