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Lunar Meteorite

Northwest Africa 8701 & unnamed 64
(paired stones)

Mali

 

Sawn face of Northwest Africa 8701
(photo credit: Stefan Ralew)

 


Lab samples of NWA 8701
(photo credit: Randy Korotev)

 

Lab samples of unnamed 64
(photo credit: Randy Korotev)

 

 

from The Meteoritical Bulletin, No. 103

Northwest Africa 8701

Mali
Purchased: 2014 September
Mass: 72 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Stefan Ralew in September 2014 in Erfoud, Morocco.

Physical characteristics: Single stone (72 g) lacking fusion crust and composed of angular, mostly whitish clasts in a very dark gray matrix with some crosscutting veins of vesicular glass.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental olivine-poor breccia composed of mineral clasts in a finer matrix. Minerals include anorthite, pigeonite, orthopyroxene, augite, ilmenite and merrillite, along with rare olivine, Cr-armalcolite and kamacite.

Geochemistry: Orthopyroxene (Fs27.0Wo2.6; FeO/MnO = 70, N = 1), ferroan pigeonite (Fs53.0Wo16.8, FeO/MnO = 65, N = 1), pigeonite (core Fs26.5Wo19.8; FeO/MnO = 54; rim Fs71.6Wo25.2; FeO/MnO = 85), augite (Fs23.4Wo41.0, FeO/MnO = 58, N = 1), olivine (Fa30.4, FeO/MnO = 92; Fa11.3, FeO/MnO = 117, N = 2), plagioclase (An96.1-96.5Or0.1-0.5, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 5.2, Na2O 0.44; (in ppm) Sc 11.8, La 6.0, Sm 2.5, Eu 0.85, Yb 2.3, Lu 0.32, Th 1.7.

Classification: Lunar (feldspathic fragmental breccia). This specimen contains much less olivine than most lunar feldspathic breccias, but some of the olivine that is present is very magnesian.

Specimens: 14.4 g including one polished endcut at UWB; main mass with Ralew.

 

Randy Says…

Northwest Africa 8701 is a moderately mafic feldspathic lunar meteorite.

 

More Information

Meteoritical Bulletin Database

NWA 8701

References

 

Korotev R. L. and Irving A. J. (2015) Keeping up with the lunar meteorites 2015. 46th Lunar and Planetary Science Conference, abstract no. 1942.

 

 

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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: 15-Oct-2015