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Northwest Africa 7946
Basic information Name: Northwest Africa 7946
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7946
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 771 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  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 18 Nov 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7946 (NWA 7946)

(Northwest Africa)

Purchased: 2013 May

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Mohamed Aid in Ouarzazate, Morocc,o in May 2013.

Petrography: (A. Irving and S. Kuehner, UWS) Composed of small (0.2-0.9 mm), well-formed chondrules plus sparse mineral fragments and fine grained, CAI occur in a fine-grained, deep-brown matrix.

Geochemistry: Olivine (Fa0.2-85.8; Cr2O3 in ferroan examples is 0.16-0.31 wt.%, mean 0.23 wt.%, s.d. 0.07 wt.%, N = 8), orthopyroxene (Fs1.2-2.0Wo1.2-1.4), subcalcic augite (Fs1.3-2.0Wo38.4-36.3).

Classification: Carbonaceous chondrite (CO3.3). Estimation of subtype based on histograms of Cr2O3 content in ferroan olivine given by Grossman and Brearley (2005).

Specimens: 20.3 g and one polished thin section are at UWB. The remainder is held by M. Aid.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2013 May
Mass (g):771
Pieces:47
Class:CO3
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):0.2-85.8 (n=10)
Ferrosilite (mol%):1.2-2.0
Wollastonite (mol%):1.2-1.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.3
Type spec location:UWB
Main mass:M. Aid
Comments:MA13-146; 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. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7377 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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