Lunar Meteorite: Northwest Africa 10626 & an unnamed pair

northwestern Africa

Northwest Africa 10626 (1849 g). Photo credit: Darryl Pitt

Lab samples NWA 10626. Photo credit: Randy Korotev

from The Meteoritical Bulletin, No. 105

Northwest Africa 10626 (NWA 10626)

(Northwest Africa)
Purchased: 2015 November
Mass: 1849 g (1 piece)

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.

Randy Says…

Compositionally, it’s a bit more mafic than a typical feldspathic lunar meteorite, probably because of the basalt clasts.

More Information

Meteoritical Bulletin Database

NWA 10626

References

Korotev R. L. and Irving A. J. (2017) Still not keeping up with the lunar meteorites – 2017Lunar 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.

Lunar Meteorites | List of Lunar meteorites