from The Meteoritical Bulletin, No. 105
Northwest Africa 10626 (NWA 10626)
Lunar meteorite (feldspathic breccia)
History: Purchased by Darryl Pitt in October 2015 from a dealer in Erfoud, Morocco.
Physical characteristics: The broken, very fresh specimen (1849 g) lacks fusion crust and consists mainly of small, angular light-colored clasts in a dark gray matrix, but there also are some larger, light gray, basaltic-textured clasts (up to 3.5 cm across).
Petrography: (A. Irving and S. Kuehner, UWS) The predominant portion is a fragmental breccia consisting of mineral clasts of anorthite, pigeonite, exsolved pigeonite, sparse olivine, ilmenite and chromite plus clasts of glass with quenched crystals. One olivine-free basaltic clast has subophitic texture with domains of variable grain size, and is composed of pigeonite, anorthite, subcalcic augite, ilmenite, Ti-Al-chromite, pyrrhotite and minor Ni-free metal; mesostasis regions contain sparse vesicles.
Geochemistry: Olivine (Fa19.9; Fa54.4; FeO/MnO = 91-98, N = 2), pigeonite (Fs39.5Wo8.2; Fs36.1Wo21.4; FeO/MnO = 50-58, N = 2), plagioclase (An91.0-97.2Or0.6-0.1, N = 2), pigeonite in basalt clast (Fs44.3Wo8.1; Fs38.6Wo25.0; FeO/MnO = 50-60, N = 2).
Bulk composition: (R. Korotev, WUSL) INAA of subsamples gave (in wt.%) FeO 5.7, Na2O 0.34; (in ppm) Sc 12.8, Cr 990, Co 15, La 2.0, Sm 1.0, Eu 0.77, Yb 0.89, Lu 0.13, Hf 0.73, Th 0.30.
Classification: Lunar (feldspathic, basalt-bearing breccia).
Specimens: 29.47 g polished slice at UWB; remainder with DPitt.
Compositionally, NWA 10626 is a bit more mafic than a typical feldspathic lunar meteorite, probably because of the basalt clasts. The pair is compositionally identical but unnamed for lack of a type specimen.
Meteoritical Bulletin Database
Korotev R. L. and Irving A. J. (2017) Still not keeping up with the lunar meteorites – 2017. Lunar and Planetary Science XLVIII, abstract no. 1498.
Korotev R. L. and Irving A. J. (2021) Lunar meteorites from northern Africa. Meteoritics & Planetary Science, 206–240.
Warren P. H. and Tang C. P. (2018) A VLT mare basalt clast within highland breccia Northwest Africa 10626. 49th Lunar and Planetary Science Conference, abstract no. 2060.