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Lunar Meteorite

Northwest Africa 10783

northwestern Africa

 

lm_nwa10783_3509m.jpg

A slice of NWA 10783. Click on image for enlargement. Thanks to Luc Labenne for the sample.

(photo credit: Luc Labenne)

 

 

from The Meteoritical Bulletin, No. 105

 

Northwest Africa 10783

 

(Northwestern Africa)

Found 2015; Purchased: 2015 May 01

Mass: 22.0 g

 

Lunar Meteorite (anorth)

 

History: Found in the Almahbas region near the frontier between Morocco and Algeria.

 

Physical characteristics: The stone is a breccia with no visible fusion crust. The type specimen is mostly light colored with metal specks, and there is a dark zone at one end.

 

Petrography: (R. Hewins, S. Pont, B. Zanda, MNHNP) Most of the prepared section is a poikilitic anorthosite resembling Apollo 77017. It consists of plagioclase phenocrysts up to 2 mm in length set in pyroxene poikilitic to stubby tiny plagioclase laths (down to 20 μm) and to olivine granules (~50 μm). Both pigeonite and augite are present, but with no obvious exsolution. Minor minerals include chromite, ilmenite, baddeleyite, taenite and kamacite. There is a dark sliver of breccia matrix at the end of the section containing a huge variety of clast types, 1 mm or smaller. These include crystal clasts (olivine, pigeonite, augite, anorthite, chromite and a silica polymorph), breccia clasts, and lithic clasts often with elongated plagioclase laths.

 

Geochemistry: Mineral compositions and Geochemistry: (R. Hewins and S. Pont, MNHNP) The olivine composition is Fa34.1±1.5, with FeO/MnO 119±14. Pyroxenes are pigeonite Fs25.4Wo11.1 and augite En49.6Fs19.2Wo31.2. Plagioclase is An94.0±0.6Ab5.5±0.6Or0.5±0.2. Taenite contains ~37% Ni. Mineral compositions are similar to those of Apollo 77017, but olivine is a little less ferroan.

 

Classification: (R. Hewins MNHN, L. Labenne Paris) Lunar poikilitic anorthositic breccia.

 

Specimens: The type specimen consists of 3.78 g and 0.63 g at MNHNP. The remaining 17.6 g minus sawdust has been sold in the form of thin slices by Labenne.

         

Randy Says…

I haven’t analyzed my sample yet.

 

More Information

Meteoritical Bulletin Database

NWA 10783

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 you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 14-March-2017