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Lunar Meteorite

Northwest Africa 8753

northwestern Africa

 

Northwest Africa 8753
(photo credit: Rachid Chaoui)

 

Lab samples of NWA 8753
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 8753

(Northwest Africa)
Purchased: 2014 September
Mass: 1345 g

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Darryl Pitt in September 2014 from a dealer in Laayoune, Morocco.

Physical characteristics: Single stone (1345 g) consisting of white and dark gray clasts in a medium gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of angular mineral clasts (anorthite, olivine, orthopyroxene, augite, exsolved pigeonite, chromite, troilite, kamacite) and sparse glass fragments (with composition equivalent to low-Ca pyroxene + anorthite) in a finer grained matrix. Rare grains of forsteritic olivine are present and are associated with Cr-pleonaste spinel.

Geochemistry: Olivine (Fa17.9; Fa35.6; Fa9.8-10.7; FeO/MnO = 89-146; N = 5), orthopyroxene (Fs26.9-44.0Wo3.1-3.6, FeO/MnO = 65-79, N = 3), augite (Fs17.5-17.9Wo44.7-41.7, FeO/MnO = 43-53, N = 2), plagioclase (An95.0-97.4Or0.2-0.1, N = 3).

Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.0, Na2O 0.36; (in ppm) Sc 4.9, La 1.7, Sm 0.8, Eu 0.79, Yb 0.6, Lu 0.15, Th 0.3.

Classification: Lunar (feldspathic fragmental breccia). This specimen is notably felsic in comparison to other lunar feldspathic breccias, and contains accessory forsteritic olivine associated with Cr-pleonaste..

Specimens: 20.4 g including one polished thin section and a polished endcut at UWB; the remainder is held by DPitt.

 

Randy Says…

Compositionally, Northwest Africa 8753 is a typical feldspathic lunar meteorite, one most similar to Dar al Gani 400.

 

More Information

Meteoritical Bulletin Database

NWA 8753

References

 

Korotev R. L. and Irving A. J. (2016) Not quite keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary Science Conference, abstract no. 1358.

 

 

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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-Feb-2016