|Price : 4500$|
Northwest Africa 13227 (NWA 13227)
Purchased: 2019 Nov
Classification: Martian meteorite (Shergottite)
History: Purchased by Mark Lyon in November 2019 from a Moroccan dealer.
Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Coarse grained (gabbroic) assemblage of zoned clinopyroxene (up to 3.5 mm), olivine (some as inclusions in clinopyroxene) and curvilinear, lath-like maskelynite (~15 vol.%), together with accessory Mg-ilmenite, Cr-ulvöspinel, pyrrhotite, baddeleyite, merrillite and chlorapatite. Minor veinlets of secondary calcite are present.
Geochemistry: Olivine (Fa35.5-51.6, FeO/MnO = 50-55, N = 11), pigeonite cores (Fs25.6-28.2Wo5.2-9.3, FeO/MnO = 28-33, N = 6), subcalcic augite rims (Fs21.5-21.6Wo31.3-31.8; Fs28.0Wo26.9; FeO/MnO = 27-30, N = 3), pigeonite rims (Fs34.6-36.6Wo12.3-15.7, FeO/MnO = 30-33, N = 3), maskelynite (An51.7-57.1Or1.8-2.8, N = 4).
Classification: Shergottite (olivine gabbroic).
Specimens: 21.6 g including one polished thin section at UWB; remainder with Mr. M. Lyon.