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Northwest Africa 8131
Basic information Name: Northwest Africa 8131
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8131
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 39.8 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  CO3
Recommended:  CO3    [explanation]

This is 1 of 554 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 27 Jan 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8131 (NWA 8131)

(Northwest Africa)

Purchased: 2013 Sep

Classification: Carbonaceous chondrite (CO3)

History: Purchased by S. Vasiliev in September 2013 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fairly abundant, small chondrules together with mineral fragments and fine-grained CAI occur in a brown, fine-grained matrix. Minerals are olivine, orthopyroxene, clinopyroxene, Ni-poor kamacite, rare kirschsteinite and minor barite. No sulfides were detected.

Geochemistry: Olivine (Fa0.8-75.5; Cr2O3 in ferroan examples is 0.14-0.29 wt.%, mean 0.17 wt.%, s.d. 0.06 wt.%, N = 9), orthopyroxene (Fs0.9-39.0Wo1.0-0.9, N = 3), clinopyroxene (Fs0.9Wo41.8).

Classification: Carbonaceous chondrite (CO3).

Specimens: 8.4 g including one polished thin section at UWB. The remaining material is held by S. Vasiliev.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2013 Sep
Mass (g):39.8
Pieces:1
Class:CO3
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):0.8-75.5
Ferrosilite (mol%):0.9-39.0
Wollastonite (mol%):1.0-0.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):8.4
Type spec location:UWB
Main mass:S. Vasiliev
Comments:SV15; 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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Cosimo Damiano Gorgoglione   
John A. Shea   
Piotr gural100   
Predrag Radovic   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7368 approved meteorites from (Northwest Africa) (plus 1957 unapproved names)

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