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Lunar Meteorite

Northwest Africa 10073 & unnamed 92
paired stones

northwestern Africa

 

Lab sample of Northwest Africa 10073
(photo credit: Randy Korotev)

 

Lab sample of unnamed 92
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10073

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

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 and its unnamed pair are typical feldspathic lunar meteorites.

 

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.

 

 

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Prepared by
: Randy L. Korotev
 
Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 5-Feb-2016