Swayyah 001        26.709°N, 8.851°W

Saguia el Hamra, Western Sahara

Purchased: 2018 Nov

Classification: Lunar meteorite (gabbro)

History: Two large stones (2338 g, 1754 g) and several smaller stones were found together. One stone (177 g) was purchased by Darryl Pitt in November 2018. The 1754 g stone was purchased by Aziz Habibi in January 2019, and subsequently acquired by Darryl Pitt, who independently purchased three additional stones from several Mauritanian dealers in March 2019.

Physical characteristics: All stones lack fusion crust. Fresh interiors have a mottled dark gray appearance with a relatively coarse grained, equigranular texture.

Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Coarse grained, with a gabbroic texture (mean grainsize 1.5 mm). Composed of patchily zoned clinopyroxene, maskelynite, and olivine, with accessory ilmenite, troilite, tranquillityite, Th-free monazite and rare kamacite. Minor secondary calcite and hyalophane were observed on some grain boundaries.

Geochemistry: Olivine (Fa_66.6-84.2, FeO/MnO = 92-102, N = 3), pigeonite cores (Fs_30.1-31.6Wo_13.4-10.4, FeO/MnO = 53, N = 2), pigeonite rim (Fs_44.4Wo_12.5, FeO/MnO = 59), subcalcic augite rim (Fs_46.9Wo_32.8, FeO/MnO = 71), maskelynite (An_85.1-89.1Or_0.8-0.3, N = 2).

Classification: Lunar (mare gabbro).

Specimens: 46.9 g including one polished thin section and one polished endcut at UWB; remainder with DPitt.