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Lunar Meteorite

Northwest Africa 10495

northwestern Africa

 

lm_nwa10495_0746_field.jpg

Northwest Africa 10495.  If someone had sent me this photo asking “Is this a meteorite,” I probably would have said “no.”

Photo credit: anonymous finder

 

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Lab sample of NWA 10495.  Click on image for enlargement. Even on a sawn face it doesn’t look much like a lunar meteorite because there are few large, light-colored clasts.

Photo credit: Randy Korotev

 

from The Meteoritical Bulletin, No. 105

 

Northwest Africa 10495

 

Morocco

Purchased: 2015

Mass: 15600 g

 

Lunar Meteorite (feldspathic breccia)

 

History: A group of similar stones were found together at an undisclosed location in southern Morocco during 2015.

 

Physical characteristics: Several grayish brown stones (total weight 15.6 kg) lacking fusion crust, but with a polished external appearance. All exhibit the same overall fine grained texture, with some visible larger whitish clasts within a dark gray matrix.

 

Petrography: (A. Irving and S. Kuehner, UWS) Relatively fine grained fragmental breccia composed of mineral clasts of anorthite, pigeonite, olivine, augite, Ti-chromite and troilite set in a matrix containing minor secondary barite.

 

Geochemistry: Olivine (Fa34.8-42.3, FeO/MnO = 86-95, N = 4), pigeonite (Fs29.8-32.4Wo8.8-12.9, FeO/MnO = 47-52, N = 3), augite (Fs20.6Wo35.4, FeO/MnO = 49), plagioclase (An96.4-97.1Or0.1, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances: (in wt.%) FeO 7.0, Na2O 0.30; (in ppm) Sc 17.0, La 1.9, Sm 1.0, Eu 0.67, Yb 1.0, Lu 0.15, Hf 0.6, Th 0.15.

 

Classification: Lunar (feldspathic breccia).

 

Specimens: 24.3 g including one stone polished on one side at UWB; the remaining material is held by the anonymous finders.

         

Randy Says…

This looks like a new one.  It’s moderately mafic but low concentrations of incompatible elements.

 

More Information

Meteoritical Bulletin Database

NWA 10495

References

 

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.


e-mail
korotev@wustl.edu

Last revised: 5-February-2017