Meteoritical Bulletin, No. 108
Northwest Africa 12216
Meteorite (feldspathic breccia)
History: Found near Wad Alma, Algeria and purchased by Darryl
Pitt in May 2018 from a Mauritanian dealer.
Physical characteristics: A small
(34.4 g) unusually hard, dark-gray stone, mostly very fine grained and
vesicular with sparse white clasts.
Petrography: (A. Irving and
S. Kuehner, UWS) Small mineral
clasts of anorthite, low-Ca pyroxene, subcalcic augite and olivine are set
in a very fine-grained, vesicular matrix containing ilmenite, Ti-poor
chromite, kamacite and troilite.
Geochemistry: Olivine (Fa19.9-37.1,
FeO/MnO = 80-119, N = 3), low-Ca pyroxene (Fs26.9Wo4.9,
FeO/MnO = 53), pigeonite (Fs23.8Wo7.1, FeO/MnO = 50),
subcalcic augite (Fs62.6Wo28.7, FeO/MnO = 75; Fs13.3Wo39.1,
FeO/MnO = 36), plagioclase (An96.9-97.4Wo0.2-0.1, N =
Classification: Lunar (feldspathic
Specimens: 9.2 g including
one polished endcut at UWB;
remainder with DPitt.