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Northwest Africa 10986
Basic information Name: Northwest Africa 10986
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10986
Observed fall: No
Year found: 2015
Country: Western Sahara
Mass:help 108.2 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 83 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 17 Dec 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10986 (NWA 10986)

Grarat Zawi, Western Sahara

Find: 15 Nov 2015

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).

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Grarat Zawi
Origin or pseudonym:Mahbed
Date:15 Nov 2015
Mass (g):108.2
Pieces:several
Class:Lunar
Weathering grade:W2
Fayalite (mol%):30.9±12.9 (N=50)
Ferrosilite (mol%):36.6±13.3 (N=73)
Wollastonite (mol%):16.4±8.2 (N=73)
Classifier:L. Taylor, S. Roberts. UTenn
Type spec mass (g):22
Type spec location:SI
Main mass:UTenn
Comments:Submitted by Lawrence A. Taylor, Sarah Roberts
Institutions
   and collections
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
UTenn: Planetary Geosciences Institute, Department of Earth and Planetary Sciences, University of Tennessee, 1412 Circle Drive, Knoxville, TN 37996-1410, United States (institutional address; updated 1 Nov 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is the only approved meteorite from Grarat Zawi, Western Sahara
     This is 1 of 204 approved meteorites from Western Sahara (plus 20 unapproved names)

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