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Northwest Africa 10176
Basic information Name: Northwest Africa 10176
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10176
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 18.1 g
Meteoritical Bulletin:  MB 105  (2016)  CM2
Recommended:  CM2    [explanation]

This is 1 of 602 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 26 May 2016
Writeup from MB 105:

Northwest Africa 10176 (NWA 10176)

(Northwest Africa)

Purchased: 2012 Sep

Classification: Carbonaceous chondrite (CM2)

History: Purchased by John Curchin in September 2012 from a Moroccan dealer at the Denver Show.

Petrography: (A. Irving and S. Kuehner, UWS) Small chondrules, mineral fragments and sparse CAI are set in a reddish-brown matrix containing relatively coarse-grained, platy cronstedtite, kamacite spheres, taenite and minor barite.

Geochemistry: Olivine (Fa2.3-57.9, N = 3), orthopyroxene (Fs0.9-1.7Wo1.1-0.5, N = 3), subcalcic augite (Fs1.1-1.5Wo32.1-38.3, N = 2). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one 1.5 mg aliquot of a powdered 20 mg bulk sample is δ17O=1.51‰, δ18O=9.27‰ , Δ17O=-3.33‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively)

Classification: Carbonaceous chondrite (CM2).

Specimens: 3.6 g including one polished thin section at UWB. The remainder is held by Mr. J. Curchin.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2012 Sep
Mass (g):18.1
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):2.3-57.9
Ferrosilite (mol%):0.9-1.7
Wollastonite (mol%):1.1-0.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):3.6
Type spec location:UWB
Main mass:J. Curchin
Comments:JC15-2; submitted by A. Irving
Plots: O isotopes:  
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
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)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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