from The Meteoritical Bulletin, No. 108
Northwest Africa 11886 (NWA 11886)
History: Bought in Erfoud, Morocco, in March 2018.
Physical characteristics: Cut surface reveals a gray interior with light grey and white clasts.
Petrography: (J. Gattacceca, CEREGE) Igneous fragmental breccia. Main minerals are pyroxene and plagioclase with typical grain size of 300 μm. Other minerals include olivine, chromite, troilite, silica polymorph (to 200 μm), ilmenite, rare metal.
Geochemistry: Pyroxene Fs44.4±6.0Wo22.9±9.0, FeO/MnO=67.3±12.4 (N=5). Plagioclase An92.7Ab7.2Or0.1 (N=2). Olivine Fa87.8, FeO/MnO=109 (N=1).
Classification: Lunar, fragmental breccia.
Specimens: 7.5 g at CEREGE. Main mass with Labenne.
NWA 11886 is a unique basaltic breccia with 21% FeO. It contains little or no material from the feldspathic highlands and is apparently derived from a basalt that is moderately rich in incompatible elements (e.g., 16.5 ppm Sm and 2.7 ppm Th).
Meteoritical Bulletin Database
Korotev R. L. and Irving A. J. (2021) Lunar meteorites from northern Africa. Meteoritics & Planetary Science, 206–240.