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
