Northwest Africa 11593 (NWA 11593)

Algeria

Purchased: 2016 May 1

Classification: HED achondrite (Eucrite)

History: Purchased by Miao Bing-an in 2016 in Morocco.

Physical characteristics: A single stone of 44.37 g, partly covered by fusion crust. Many cracks penetrate the interior of this meteorite. Dimensions: 4.5 × 4.0 × 5.0 cm.

Petrography (L. Huang, B. Miao, H. Chen, GUT): Breccia containing a variety of basaltic lithologies; also contains <10 vol% cumulate lithologies. Cumulate eucrite lithologies are coarse-grained (~0.5-1 mm) gabbros composed principally of low-Ca zoned clinopyroxene and calcic plagioclase. Basaltic breccia lithologies have fine to medium grain size, textures are subophitic to ophitic, and they contain very fine-grained vitrophyric textured basaltic lithologies. A silica phase is commonly present. Accessories are ilmenite, chromite, troilite and rare iron metal.

Geochemistry (L. Huang, B. Miao, H. Chen, GUT): Bulk pyroxene: Fe/Mn=34.9. Low-Ca pyroxene of cumulate lithologies: median compositions are Mg#=51.9, Fs_46.3Wo_3.8 (n=20). Low-Ca pyroxene of basaltic lithologies: median compositions are Mg#=41.5, Fs_55.3Wo_5.6 (n=36). High-Ca pyroxene of basaltic lithologies: median compositions are Mg#=43.4, Fs_47.6Wo_16.6 (n=45). Plagioclase: An_83.9-92.9Or_0.32-2.63, median An_90.1Or_0.9 (n=25).

Classification: Basaltic polymict brecciated eucrite

Specimens: 12.1 g and polished thin section are deposited in GUT