Description
Northwest Africa 13187 (NWA 13187)
(Northwest Africa)
Purchased: 2019 Sep
Classification: Martian meteorite (Shergottite)
History: Purchased by Mark Lyon in September 2019 from a Moroccan dealer. Some of this material was subsequently sold to Mike Fleeman and Roberto Vargas.
Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture. Composed predominantly of zoned clinopyroxene and maskelynite with accessory ulvöspinel (some Cr-bearing), ilmenite, silica polymorph, merrillite, pyrrhotite and minor secondary calcite.
Geochemistry: Subcalcic augite cores (Fs20.3-23.3Wo36.2-32.0, FeO/MnO = 28-29, N = 4), ferroan pigeonite rims (Fs52.4-59.2Wo14.2-19.7, FeO/MnO = 36-39, N = 4), maskelynite (An50.5-57.2Or1.9-0.7, N = 3).
Classification: Shergottite (diabasic).
Specimens: 20.1 g including one polished thin section at UWB; remainder held by Mr. M. Lyon, Mr. M. Fleeman (550 g) and Mr. R. Vargas (50 g).
