from The Meteoritical Bulletin, No. 107
Northwest Africa 11851 (NWA 11851)
Lunar Meteorite (feldspathic breccia)
History: Found in the Azawad region of northern Mali and purchased by Habib Naji in March 2018.
Physical characteristics: A fine grained, medium gray stone (227 g) with macroscopically indistinct clasts; partly coated by light brown weathering products.
Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Polymict breccia consisting of small mineral clasts (anorthite, olivine, pigeonite, augite, orthopyroxene, ilmenite, Ti-Cr-Mg-Al spinel, troilite, merrillite, kamacite) and small lithic clasts (including gabbroic lithologies and quench-textured melt rocks) in a finer grained matrix.
Geochemistry: Olivine (Fa17.8-23.5, FeO/MnO = 90-127, N = 3), orthopyroxene (Fs16.1Wo3.8, FeO/MnO = 53), pigeonite (Fs25.4-37.2Wo8.1-13.0, FeO/MnO = 54-60, N = 3), augite (Fs44.1Wo35.6, FeO/MnO = 62), plagioclase (An95.5-95.7Or0.5-0.3, N = 2).
Classification: Lunar (feldspathic breccia).
Specimens: 22 g including one polished thin section at UWB; remainder with Mr. H. Naji.
Compositionally, NWA 11851 is a troctolitic feldspathic lunar meteorite.
Meteoritical Bulletin Database
Korotev R. L. and Irving A. J. (2021) Lunar meteorites from northern Africa. Meteoritics & Planetary Science, 206–240.