Lunar Meteorite: Northwest Africa 10073

...and an unnamed pair

Exterior and endcut of NWA 10073 (alleged). Photo credit: Christies.
Lab sample of Northwest Africa 10073. Photo credit: Randy Korotev
Lab sample of Northwest Africa 10073 unnamed pair. Photo credit: Randy Korotev
from The Meteoritical Bulletin, No. 104

Northwest Africa 10073 (NWA 10073)

(Northwest Africa)
Purchased: 2015 January
Mass: 64 g (1 piece)

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in Temara, Morocco by Adam Aaronson in January 2015.

Physical characteristics: Single stone (64 g) with a wind-ablated exterior and an interior consisting of whitish clasts (up to 8 mm) in a dark gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of mineral clasts of anorthite, olivine, orthopyroxene, subcalcic augite, augite, ferropigeonite, ilmenite, Al-bearing chromite, Ni-poor kamacite and troilite, together with rare glass fragments, in a finer grained matrix. Patches of shock glass are present.

Geochemistry: Olivine (Fa24.6-40.4, FeO/MnO = 88-105, N = 3), orthopyroxene (Fs11.8Wo3.0; Fs31.1-38.9Wo2.3-2.2; Fs50.7Wo2.1; FeO/MnO = 54-65, N = 3), pigeonite (Fs19.4Wo10.6, FeO/MnO = 63), ferropigeonite (Fs54.2Wo16.6, FeO/MnO = 62), titanian ferropigeonite (Fs74.6Wo14.8, FeO/MnO = 65, TiO2 = 8.4 wt.%, Al2O3 = 1.4 wt.%, Na2O = 0.18 wt.%), subcalcic augite (Fs38.0Wo27.0, FeO/MnO = 58), augite (Fs6.5Wo43.7, FeO/MnO = 39), plagioclase (An95.5-98.5Or0.2, N = 2).

Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.7, Na2O 0.40; (in ppm) Sc 7.4, Ni 160, La 3.1, Sm 1.45, Eu 0.80, Yb 1.1, Lu 0.15, Hf 1.1, Th 0.57.

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 12.8 g including one polished endcut at UWB. The remainder is held by Aaronson.

Randy Says…

Compositionally, Northwest Africa 10073 is a typical feldspathic lunar meteorite. The unnamed pair is compositionally identical.

More Information

Meteoritical Bulletin Database

NWA 10073

References

Korotev R. L. and Irving A. J. (2016) Not quite keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary Science Conference, abstract no. 1358.

Korotev R. L. and Irving A. J. (2021) Lunar meteorites from northern Africa. Meteoritics & Planetary Science, 206–240.