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Lunar Meteorite

Northwest Africa 12368

northwestern Africa

 

from The Meteoritical Bulletin, No. 107

 

Northwest Africa 12368

 

Mauritania

Purchased: 2018

Mass: 1868 g

 

Lunar Meteorite (feldspathic breccia)

 

History: Found in the spring of 2017 in the Moroccan Sahara and purchased in Temara by A. Aaronson on July 23, 2018.

 

Physical characteristics: Single complete stone, no fusion crust; saw cut reveals a fragmental breccia with scattered white feldspathic and mafic clasts set in a dark-gray groundmass.

 

Petrography: (C. Agee, UNM) This meteorite consists primarily of fragmental pyroxene, olivine, feldspathic and mafic clasts, and shock melt. Ubiquitous Fe-Ti-Cr-Al oxides are present, rare kamacite was detected. There appears to be 2 or 3 distinct populations of pyroxenes and olivines, suggesting that this is a polymict breccia.

 

Geochemistry: (C. Agee, UNM) olivine Fa53.3±11.8, Fe/Mn=96±7, n=7; fayalite Fa91.8±2.9, Fe/Mn=91±8, n=3; pigeonite Fs26.0±1.3Wo6.4±1.3, Fe/Mn=51±3, n=7; subcalcic augite Fs38.3±3.2Wo24.2±4.3, Fe/Mn=57±3, n=2; ferro-augite Fs63.9±4.3Wo30.4±7.6, Fe/Mn=92±21, n=2; plagioclase An95.5±1.4, n=6; Shock melt (20 µm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.6±1.5, TiO2=0.18±0.13, Al2O3=28.8±4.2, Cr2O3=0.11±0.14, MgO=4.1±1.8, FeO=4.2±2.1, MnO=0.07±0.03, CaO=16.8±1.9, NiO=0.02±0.02, Na2O=0.54±0.14, K2O=0.06±0.04 (all wt%), n=3.

 

Classification: Lunar feldspathic breccia

 

Specimens: 20.6 g including a probe mount on deposit at UNM, Adam Aaronson holds the main mass.

 

Randy Says…

I have not studied this one.

 

More Information

Meteoritical Bulletin Database

NWA 12368

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: 7 January 2019