Lunar Meteorite

Northwest Africa 11871



from The Meteoritical Bulletin, No. 107


Northwest Africa 11871



Purchased: 2018

Mass: 21.9 g


Lunar meteorite (feldspathic breccia)


History: Stones were acquired from a Moroccan dealer in 2017.


Physical characteristics: Purportedly found near Tindouf, Algeria and purchased by Joseph Hum in May 2018 from a dealer in Gladstone, Oregon, who obtained it from a Mauritanian source.


Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of mineral clasts of anorthite, olivine, exsolved pigeonite, unexsolved pigeonite, orthopyroxene, aluminous subcalcic augite, chromite, ilmenite, troilite and kamacite in a fine grained, partly vesicular matrix.


Geochemistry: Olivine (Fa19.7-51.6, FeO/MnO = 92-105, N = 3), orthopyroxene host (Fs45.7Wo3.6, FeO/MnO = 55), clinopyroxene exsolution lamella (Fs24.2Wo34.6, FeO/MnO = 54), orthopyroxene (Fs47.9Wo3.6, FeO/MnO = 59), pigeonite (Fs24.8Wo10.0, FeO/MnO = 68), aluminous subcalcic augite (Fs18.5Wo23.9, FeO/MnO = 56, Al2O3 = 15.4 wt.%, Na2O = 0.4 wt.%), plagioclase (An94.1-96.4Or0.3-0.1).


Classification: Lunar (feldspathic regolithic breccia).


Specimens: 4.73 g including a polished endcut at UWB; remainder with Mr. J. Hum.


Randy Says…

I have not studied this one. It might be an NWA 8046 pair.


More Information

Meteoritical Bulletin Database

NWA 11871




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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 that
you’ve found until you read this and this.



Last revised: 18 December 2018