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Lunar Meteorite

Northwest Africa 10986

 Western Sahara

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10986

Grarat Zawi, Western Sahara
Find: 15 November 2015
Mass: 108.2 g

Classification: Lunar meteorite

Physical characteristics: Total mass of the meteorite = 108.2 g and comprises several pieces, the larger weighing 80.5 g.

Petrography: (S. Roberts, UTenn) A highland impact-melt breccia with an unusually large amount of impact-generated glass. Displays multiple generations of melting and breccia-in-breccia formation. Brown to black devitrified glass swirls encompass heavily fragmented lithic clasts and mineral fragments. Lithic clasts represent 40% of the meteorite and have been partially to completely consumed during multiple impact and melting events. Clasts are heavily brecciated and range in size from 1.4 to 0.1 mm long. The clasts are plagioclase-rich with pyroxenes, olivines, spinel, and ilmenite in ophitic to poikilitic textures. Large broken plagioclase grains and small olivines and pyroxenes are found within the matrix. Lithic types range from FANs to Hi-Mg Suite rocks.

Geochemistry: Mineral compositions and geochemistry: Analyses were obtained from both lithic clasts and lose mineral fragments from within the breccia matrix. Plagioclase compositions average An95.7±1.7 (N=43). Average pyroxene composition is Fs36.6±13.3Wo16.4±8.2 (N=73). Average olivine composition is Fs30.9±12.9 (N=50). Fe/Mn ratios for pyroxenes are 58.7±8.1 (N= 73) and olivines are 98.8±8.7 (N=50).

 

Randy Says…

This one may be paired with another.  I don’t have a sample.

 

More Information

Meteoritical Bulletin Database

NWA 10986

References

Roberts S. E., Jean M. M., Sueilem M. B., and Taylor L. A. (2017) Northwest Africa 10986: An impact-melt breccia from the lunar highlands. 48th Lunar and Planetary Science Conference, abstract no. 2220.

 

 

 

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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