The Meteoritical Bulletin, No. 105
Purchased: 2015 November
Mass: 1849 g
meteorite (feldspathic breccia)
Purchased by Darryl Pitt in October 2015 from a dealer in Erfoud, Morocco.
characteristics: The broken, very fresh specimen (1849 g)
lacks fusion crust and consists mainly of small, angular light-colored
clasts in a dark gray matrix, but there also are some larger, light gray,
basaltic-textured clasts (up to 3.5 cm across).
Irving and S. Kuehner, UWS) The
predominant portion is a fragmental breccia consisting of mineral clasts of
anorthite, pigeonite, exsolved pigeonite, sparse olivine, ilmenite and
chromite plus clasts of glass with quenched crystals. One olivine-free
basaltic clast has subophitic texture with domains of variable grain size,
and is composed of pigeonite, anorthite, subcalcic augite, ilmenite,
Ti-Al-chromite, pyrrhotite and minor Ni-free metal; mesostasis regions
contain sparse vesicles.
Olivine (Fa19.9; Fa54.4; FeO/MnO = 91-98, N = 2),
pigeonite (Fs39.5Wo8.2; Fs36.1Wo21.4;
FeO/MnO = 50-58, N = 2), plagioclase (An91.0-97.2Or0.6-0.1,
N = 2), pigeonite in basalt clast (Fs44.3Wo8.1; Fs38.6Wo25.0;
FeO/MnO = 50-60, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave (in wt.%) FeO 5.7, Na2O
0.34; (in ppm) Sc 12.8, Cr 990, Co 15, La 2.0, Sm 1.0, Eu 0.77, Yb 0.89, Lu
0.13, Hf 0.73, Th 0.30.
Lunar (feldspathic, basalt-bearing breccia).
29.47 g polished slice at UWB;
remainder with DPitt.