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Northwest Africa 10831
Basic information Name: Northwest Africa 10831
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10831
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 834 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  LL3
Recommended:  LL3    [explanation]

This is 1 of 342 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 24 Sep 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10831 (NWA 10831)

(Northwest Africa)

Purchased: 2015 Nov

Classification: Ordinary chondrite (LL3)

History: Purchased by Kally Wombacher in November 2015 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Closely packed, well-formed chondrules (apparent diameter 800±400 μm) are set in a sparse fine grained, black matrix.

Geochemistry: Olivine (Fa1.7-44.5, Cr2O3 in ferroan examples 0.05-0.18 wt.%, mean 0.10±0.04 wt.%, N = 8), orthopyroxene (Fs3.1-23.7Wo0.4-1.6, N = 3), subcalcic augite (Fs6.6Wo31.2), augite (Fs3.3Wo41.1). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.80.

Classification: Ordinary chondrite (LL3).

Specimens: 22 g including one polished thin section at UWB; remainder with Mr. K. Wombacher.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2015 Nov
Mass (g):834
Pieces:2
Class:LL3
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):1.7-44.5
Ferrosilite (mol%):3.1-23.7
Wollastonite (mol%):0.4-1.6
Magnetic suscept.:3.80
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22
Type spec location:UWB
Main mass:K. Wombacher
Comments:KW16-1; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
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: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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