from The Meteoritical Bulletin, No. 112
Northwest Africa 15686 (NWA 15686)
Lunar meteorite (feldspathic breccia)
History: Shun-Chung Yang (S-R Meteorites) purchased an 80.2g stone Youssef Bennani in Guelmim, Morocco, in 2022.
Physical Characteristics: Type specimen is an irregular shaped sliced chunk with a thin discontinuous layer of dark green fusion crust. The cut faces show the interior has a matrix-supported brecciated texture.
Petrography: Description and classification (A. Love, App) Sample is a breccia composed of lithic fragments set within a grain-supported host of mineral debris, glassy melt clasts, agglutinates and rare glass beads. Lithic fragments are basalt, coarse-grained gabbro, anorthosite and shock-melted brecciated clasts. Some regions of sample show micro-vesicular matrix. Minerals clasts are dominated by clinopyroxene, plagioclase and olivine. Additional minerals are: chromite, FeNi grains, troilite, chromite and apatite, ilmenite and a Si polymorph.
Geochemistry: (A. Love, App) Olivine (Fa42.6±9.1, Fe/Mn=102.9±5.4, n=12); pigeonite (Fs34.4±11.0Wo18.1±7.9, Fe/Mn=51.6±17.2 n=17); high-Ca pyroxene (Fs37.3±11.1Wo20.4±9.7, Fe/Mn=63.1±9.6, n=5); plagioclase (An95.2±1.6Or0.2±0.2, n=14).
Classification: Lunar achondrite (feldspathic breccia A-S2 low weathering). Based on textures and mineral compositions, sample is a regolithic feldspathic breccia.
Specimens: Shun-Chung Yang (S-R meteorites) holds the main mass. A polished thin section and a crusted sliced individual have a total mass of 16.2 g.
I have not studied Northwest Africa 15686.
Meteoritical Bulletin Database