NWA 12564 (Mars, shergottite)

 45.00 220.00

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Northwest Africa 12564 (NWA 12564)

(Northwest Africa)

Purchased: 2019 Feb

Classification: Martian meteorite (Shergottite)

History: Purportedly found in Mauritania and purchased in February 2019 by Jaouad Chaoui and Rachid Chaoui from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic texture (mean grainsize ~1 mm). Composed predominantly of complexly-zoned clinopyroxene and maskelynite with accessory titanomagnetite, ilmenite, chlorapatite, merrillite, and pyrrhotite. Myrmekitic intergrowths consisting of silica polymorph + relatively sodic plagioclase are associated with more calcic maskelynite and regions of K-rich glass containing blebs of pyrrhotite are also present.

Geochemistry: Subcalcic augite (Fs22.5-48.6Wo32.2-25.4, FeO/MnO = 30-36, N = 3), ferropigeonite (Fs65.5Wo15.9, FeO/MnO = 39), large maskelynite grains (An48.6-53.0Or2.3-2.0, N = 2), plagioclase in intergrowth with silica polymorph (An34.0Ab62.4Or3.6).

Classification: Shergottite (aphyric, diabasic).

Specimens: 26.5 g including one polished thin section at UWB; remainder held jointly by J. Chaoui and R. Chaoui.

Additional information

Weight N/A

0.222g, 0.355g, 0.379g, 0.441g, 0.482g, 0.547g, 0.572g, 1.10g, 3.08g