The Meteoritical Bulletin, No.
Northwest Africa 11127
2015; Purchased: 2016 April
Meteorite (feldspathic breccia)
by Darryl Pitt in April 2016 from a dealer in Mauritania.
characteristics: A single stone (474.6 g)
lacking fusion crust and consisting of diffuse white to pale brownish
clasts in a medium gray, very fine-grained matrix containing small
(A. Irving and S. Kuehner, UWS)
Breccia composed of lithic clasts and angular mineral grains of anorthite,
olivine, orthopyroxene, pigeonite and exsolved pigeonite with accessory
kamacite, Ti-chromite, ilmenite and minor troilite in a sparse finer
grained, partly devitrified matrix (exhibiting "swirly" texture).
The majority of the lithic clasts are fine grained
melt rocks. Veinlets of shock glass plus secondary calcite and minor barite
(Fa8.9-45.0, FeO/MnO = 74-79, N = 3), orthopyroxene (Fs20.9Wo4.6,
FeO/MnO = 64), pigeonite (Fs40.9Wo19.2, FeO/MnO =
56), high-Ca pyroxene host (Fs17.3Wo41.1, FeO/MnO =
79), low-Ca exsolution lamella (Fs36.4Wo5.3, FeO/MnO
= 61), plagioclase (An96.4-96.5Or0.2, N = 2). Bulk
composition (R. Korotev, WUSL)
INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.7, Na2O 0.34; (in ppm) Sc 14.5, Ni
90, La 4.4, Sm 1.76, Eu 0.75, Yb 1.5, Lu 0.22, Hf 1.4, Th 0.57.
Lunar (feldspathic breccia).
20.6 g including one polished thin section at UWB; remainder with DPitt.