Lunar Meteorite: Northwest Africa 12368
from The Meteoritical Bulletin, No. 107
Northwest Africa 12368 (NWA 12368)
Lunar Meteorite (feldspathic breccia)
History: Found in the spring of 2017 in the Moroccan Sahara and purchased in Temara by A. Aaronson on July 23, 2018.
Physical characteristics: Single complete stone, no fusion crust; saw cut reveals a fragmental breccia with scattered white feldspathic and mafic clasts set in a dark-gray groundmass.
Petrography: (C. Agee, UNM) This meteorite consists primarily of fragmental pyroxene, olivine, feldspathic and mafic clasts, and shock melt. Ubiquitous Fe-Ti-Cr-Al oxides are present, rare kamacite was detected. There appears to be 2 or 3 distinct populations of pyroxenes and olivines, suggesting that this is a polymict breccia.
Geochemistry: (C. Agee, UNM) olivine Fa53.3±11.8, Fe/Mn=96±7, n=7; fayalite Fa91.8±2.9, Fe/Mn=91±8, n=3; pigeonite Fs26.0±1.3Wo6.4±1.3, Fe/Mn=51±3, n=7; subcalcic augite Fs38.3±3.2Wo24.2±4.3, Fe/Mn=57±3, n=2; ferro-augite Fs63.9±4.3Wo30.4±7.6, Fe/Mn=92±21, n=2; plagioclase An95.5±1.4, n=6; Shock melt (20 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.6±1.5, TiO2=0.18±0.13, Al2O3=28.8±4.2, Cr2O3=0.11±0.14, MgO=4.1±1.8, FeO=4.2±2.1, MnO=0.07±0.03, CaO=16.8±1.9, NiO=0.02±0.02, Na2O=0.54±0.14, K2O=0.06±0.04 (all wt%), n=3.
Classification: Lunar feldspathic breccia
Specimens: 20.6 g including a probe mount on deposit at UNM, Adam Aaronson holds the main mass.
I have not studied Northwest Africa 12368.
Meteoritical Bulletin Database