Lunar Meteorite

Northwest Africa 10258

northwestern Africa



Two sides of a slice of NWA 10258. Thanks to Steve Arnold for the sample.
(photo credit: Randy Korotev)


Another lab sample of NWA 10258. Thanks to Carl Agee for the sample.
(photo credit: Randy Korotev)


from The Meteoritical Bulletin, No. 104

Northwest Africa 10258

Northwestern Africa
Purchased: 2015
Mass: 58 g

Lunar meteorite

History: Purchased by Steve Arnold from Morocco, 2015.

Physical characteristics: Single stone, dark irregular surface, no fusion crust. A saw cut reveals numerous light-colored clasts set in a dark groundmass.

Petrography: (C. Agee, UNM) This meteorite is mixture of a fine-grained cataclastic domains, fragmental plagioclase and pyroxene crystals, fragmental anorthosite clasts, and shock melt veins; some of the veins have ~200 µm-size vesicles. Accessory troilite, ilmenite, and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa37.9±1.3, Fe/Mn=98±7, n=6; pigeonite Fs38.9±13.7Wo11.5±6.0, Fe/Mn=62±10, n=5; augite Fs22.7Wo40.0, Fe/Mn=57±5, n=1; plagioclase An96.2±0.5, n=3; Shock melt (20 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=46.3±1.8, TiO2=0.44±0.18, Al2O3=26.9±5.3, Cr2O3=0.014±0.10, MgO=5.6±2.7, FeO=6.4±3.2, MnO=0.08±0.05, CaO=14.4±2.0, NiO=0.03±0.03, Na2O=0.54±0.24, K2O=0.14±0.07 (all wt%), MgO+FeO=12.1±5.5 (wt%), n=11.

Classification: Lunar (feldspathic breccia)

Specimens: 11.7 g including a probe mount on deposit at UNM, Steve Arnold holds the main mass.


Randy Says…

This look like a new one.


More Information

Meteoritical Bulletin Database

NWA 10258


Korotev R. L. and Irving A. J. (2017) Still not keeping up with the lunar meteorites – 2017. 48th Lunar and Planetary Science Conference, abstract no. 1498.



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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.


Last revised: 30-March-2017