NWA 12269 (15,520g)
Northwest Africa 12269 (NWA 12269)
Purchased: 2018 Jul
Classification: Martian meteorite (Shergottite)
History: Purchased in Ouarzazate, Morocco by Mohamed Aid in July 2018.
Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Relatively fine grained with intersertal texture. Composed predominantly of zoned clinopyroxene and maskelynite (some exhibiting a curved, narrow lath-like habit) with accessory fine grained intergrowths of hedenbergite+fayalite+silica, Fe-Ti oxides, merrillite and pyrrhotite.
Geochemistry: Subcalcic augite (Fs24.8-41.8Wo31.4-24.3, FeO/MnO = 30-33, N = 3), ferropigeonite (Fs66.9-73.0Wo16.6-16.5, FeO/MnO = 41-43, N = 2), maskelynite (An51.9-53.1Or1.3-1.2, N = 2).
Classification: Martian (shergottite, fine-intersertal)
Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. Aaronson.