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Lunar Meteorite

Northwest Africa 12593

Mali

 

from The Meteoritical Bulletin, No. 108

Northwest Africa 12593

Mali
Purchased: 2017
Mass: 332.8 g

Lunar (fragmental breccia)

History: A single weathered stone lacking fusion crust found in Mali by nomads. Purchased by Dustin Dickens in Nouakchott, Mauritania, in 2017 from an anonymous meteorite dealer.

Physical characteristics: Dark, sand-blasted exterior, with many irregular shaped fragments set in a fine-grained dark groundmass. No fusion crust.

Petrography: (T. S. Hayden, M. Anand, OU) The meteorite is clast-rich fragmental breccia containing numerous mineral fragments and lithic clasts embedded in a fine-grained, vesiculated (regolith) matrix. The lithic clast population consists of basaltic clasts, granulite clasts and crystalline impact-melt breccias of olivine norite compositions. Size range of the clasts is 0.56-2.56 mm, and the main minerals are pyroxene, feldspar, olivine, silica, chromite, ilmenite, zircon and Ca phosphates (merrillite and apatite).

Mineral composition and Geochemistry: (T. S. Hayden, M. Anand, OU) Feldspar (An93.8±2.7, Ab5.9±2.5, n=39), pigeonite (Fs30.5±9.1Wo13.1±3.4, FeO/MnO = 59.3±6.6, n=59), augite (Fs23.1±6.1Wo30.9±4.3, FeO/MnO = 54.2±4.4, n=18), olivine (Fa38.2±11.7, FeO/MnO = 103.2±7.1, n= 40). O isotopes (measured at OU): Repetition 1: δ17O = 3.328‰, δ18O = 6.361‰, Δ17O=-0.005‰ (linearized using a slope of 0.5247 (of Miller, M. F. (2002) GCA 66(11)), Repetition 2: δ17O = 3.203‰, δ18O = 6.106‰, Δ17O=-0.004‰ (linearized using a slope of 0.5247. Mean: δ17O = 3.266 ± 0.088‰ (1-sigma), δ18O = 6.234 ± 0.180‰ (1-sigma), Δ17O=0.000±0.006‰ (1sigma).

Classification: Lunar fragmental regolith breccia.

Specimens: Specimen: 24 g type specimen held at OU. Dustin Dickens holds the main mass.

 

Randy Says…

I have not studied this one.

 

More Information

Meteoritical Bulletin Database

NWA 12593

 

References

 

 

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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.

 

e-mailkorotev@wustl.edu

Last revised: 16 May 2019