Meteoritical Bulletin, No. 108
Northwest Africa 12384
meteorite (basaltic breccia)
History: Purchased in Agadir, Morocco, in November 2018 by Aziz
Physical characteristics: Two dense
stones (total 244 g) coated by a thin, dark brown patina, but exhibiting a
very fresh, gray interior with some visible basaltic clasts.
Petrography: (P. Carpenter, WUSL and A. Irving, UWS)
The specimen is a breccia consisting of rounded mare basalt clasts with
intersertal texture set in a matrix of related crystalline debris. Major
mineral phases are olivine, pigeonite (some zoned to ferropigeonite) and
anorthite with accessory ilmenite, merrillite, fluorapatite, troilite,
zirconolite, tranquillityite and FeNi metal. The basalt clasts also contain
K-rich mesostasis. A fine grained vesicular shock
vein crosscuts the studied sample.
Geochemistry: Olivine in
breccia matrix (Fa30.0-50.4, FeO/MnO = 93-113, N = 6), pigeonite
in breccia matrix (Fs30.6-31.8Wo10.4-22.7, FeO/MnO =
54-58, N = 2), pigeonite in basalt clast (cores Fs28.9-29.4Wo7.9-8.4,
FeO/MnO = 50-56, N = 3; rims Fs44.8-79.6Wo16.3-20.4,
FeO/MnO = 59-88, N = 3), subcalcic augite in breccia matrix (Fs24.6Wo31.5,
FeO/MnO = 59), plagioclase in breccia matrix (An81.1-95.6Or1.1-0.1,
N = 2), plagioclase in basalt clast (An82.3-89.7Or0.7-0.4,
N = 4).
(mare basalt breccia).
Specimens: 22.3 g including
one polished endcut and one polished thin section at UWB; remainder with Labenne