Lunar Meteorite: Northwest Africa 10073 & unnamed pair

northwestern Africa

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.

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. 

Lunar Meteorites | List of Lunar meteorites