Meteoritical Bulletin, No. 107
Northwest Africa 12248
History: Found in Mauritania and purchased by Darryl Pitt in May
2018 from a Mauritanian dealer.
Physical characteristics: A small
(37.3 g) dark stone lacking fusion crust but coated by a shiny desert
patina. The fresh interior contains small white and beige clasts set in a
Petrography: (A. Irving and
S. Kuehner, UWS) Breccia composed
of mineral clasts of anorthite, olivine, low-Ca pyroxenes, augite, ilmenite
and troilite in a fine grained matrix containing
Ni-poor metal and minor barite.
Geochemistry: Olivine (Fa44.5,
FeO/MnO = 105; Fa13.1, FeO/MnO = 54; N = 2), low-Ca pyroxene (Fs38.2Wo4.5,
FeO/MnO = 59), pigeonite (Fs32.0-32.5Wo14.6-9.7,
FeO/MnO = 55-62, N = 2), augite (Fs22.4Wo43.1,
FeO/MnO = 51), anorthite (An94.3-95.9Or0.2, N = 2).
Specimens: 9.5 g including
one polished thin section at UWB;
remainder with DPitt.