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Northwest Africa 12764
Basic information Name: Northwest Africa 12764
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12764
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 158.8 g
Recommended:  CO3    [explanation]

This is 1 of 522 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 26 Sep 2019
Writeup from MB 108:

Northwest Africa 12764 (NWA 12764)

(Northwest Africa)

Purchased: 2018 Apr

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Beat Booz in April 2018 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Small chondrules (apparent diameter 170±80 µm, N = 21), mineral fragments and fine grained CAI are set in a fine grained matrix (~40 vol.%, deep reddish-brown in thin section). Opaque phases are kamacite, taenite, troilite and chromite.

Geochemistry: Olivine, Fa24.2±21.3 (range Fa0.6-45.8, N = 5); low-Ca pyroxene, Fs0.9Wo3.3, Fs42.3Wo4.2; anorthite, An96.4Or0.1.

Classification: Carbonaceous chondrite (CO3).

Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. B. Booz.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018 Apr
Mass (g):158.8
Shock stage:S2
Weathering grade:low
Fayalite (mol%):24.2±21.3
Ferrosilite (mol%):0.9; 42.3
Wollastonite (mol%):3.3; 4.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.5
Type spec location:UWB
Main mass:B. Booz
Comments:Work name BB-82; submitted by A. Irving
   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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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