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Lunar Meteorite

Northwest Africa 11783

northwestern Africa

 

from The Meteoritical Bulletin, No. 107

 

Northwest Africa 11783

 

(northwestern Africa)

Purchased: 20 September 2014

Mass: 65 g

 

Lunar meteorite (feldspathic breccia)

 

History: Purchased by Jay Piatek from a Moroccan meteorite dealer.

 

Physical characteristics: Several visually identical appearing pieces. No fusion crust. A saw cut reveals a fragmental breccia with white feldspathic clasts set in a dark gray ground mass.

 

Petrography: (C. Agee, UNM) This meteorite is a breccia of fragmental pyroxene, olivine, plagioclase grains. There are many domains that are fine-grained and cataclastic with shock melt and vesicles. Fe-metal, chromite, ilmenite, silica, and a phosphate mineral were detected.

 

Geochemistry: (C. Agee, UNM) olivine Fa: 28.1±4.8, Fe/Mn=100±2, n=4; clinopyroxene Fs19.0±4.4Wo23.1±17.6, Fe/Mn=52±8, n=3; plagioclase An94.6±1.3, n=3; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=46.0±0.4, TiO2=0.51±0.02, Al2O3=28.0±0.5, Cr2O3=0.11±0.01, MgO=6.0±0.2, FeO=4.7±0.2, MnO=0.07±0.00, CaO=15.3±0.1, Na2O=0.61±0.03, K2O=0.16±0.01 (all wt%), n=7.

 

Classification: Lunar feldspathic breccia.

 

Specimens: 13 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

 

Randy Says…

I have not studied this one.

 

More Information

Meteoritical Bulletin Database

NWA 11783

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: 18 December 2018