Lunar Meteorite: Northwest Africa 8753
from The Meteoritical Bulletin, No. 104
Northwest Africa 8753 (NWA 8753)
Classification: Lunar meteorite (feldspathic breccia)
History: Purchased by Darryl Pitt in September 2014 from a dealer in Laayoune, Morocco.
Physical characteristics: Single stone (1345 g) consisting of white and dark gray clasts in a medium gray matrix.
Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of angular mineral clasts (anorthite, olivine, orthopyroxene, augite, exsolved pigeonite, chromite, troilite, kamacite) and sparse glass fragments (with composition equivalent to low-Ca pyroxene + anorthite) in a finer grained matrix. Rare grains of forsteritic olivine are present and are associated with Cr-pleonaste spinel.
Geochemistry: Olivine (Fa17.9; Fa35.6; Fa9.8-10.7; FeO/MnO = 89-146; N = 5), orthopyroxene (Fs26.9-44.0Wo3.1-3.6, FeO/MnO = 65-79, N = 3), augite (Fs17.5-17.9Wo44.7-41.7, FeO/MnO = 43-53, N = 2), plagioclase (An95.0-97.4Or0.2-0.1, N = 3).
Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.0, Na2O 0.36; (in ppm) Sc 4.9, La 1.7, Sm 0.8, Eu 0.79, Yb 0.6, Lu 0.15, Th 0.3.
Classification: Lunar (feldspathic fragmental breccia). This specimen is notably felsic in comparison to other lunar feldspathic breccias, and contains accessory forsteritic olivine associated with Cr-pleonaste.
Specimens: 20.4 g including one polished thin section and a polished endcut at UWB; the remainder is held by DPitt.
Compositionally, Northwest Africa 8753 is a typical feldspathic lunar meteorite.
Meteoritical Bulletin Database
Korotev R. L. and Irving A. J. (2016) Not quite keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary Science Conference, abstract no. 1358.
Korotev R. L. and Irving A. J. (2021) Lunar meteorites from northern Africa. Meteoritics & Planetary Science, 206–240.