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Northwest Africa 11564
Basic information Name: Northwest Africa 11564
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11564
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 3.13 kg
Meteoritical Bulletin:  MB 107  (2018)  CO3
Recommended:  CO3    [explanation]

This is 1 of 586 approved meteorites (plus 4 unapproved names) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 12 Jan 2018
Writeup from MB 107:

Northwest Africa 11564 (NWA 11564)

(Northwest Africa)

Purchased: 2017 Sep

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Habib Naji in September 2017 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Small, rounded to irregularly shaped chondrules (apparent diameter 165 ± 80 µm, N = 20) accompanied by sparse angular mineral grains and some very fine grained CAI are set in a finer grained matrix (~30 vol.%, brown in thin section).

Geochemistry: Olivine (Fa1.2-64.7, Cr2O3 in ferroan examples <0.02 wt.%, N = 7), orthopyroxene (Fs0.8-27.5Wo0.8-3.0, N = 3), clinopyroxene (Fs1.5-4.4Wo43.7-47.7, N = 2).

Classification: Carbonaceous chondrite (CO3). The below detection limit Cr2O3 contents in ferroan olivines indicate a petrologic subtype >3.6.

Specimens: 24.05 g including one polished thin section at UWB; remainder with H. Naji.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Sep
Mass (g):3130
Shock stage:S2
Weathering grade:low
Fayalite (mol%):1.2-64.7
Ferrosilite (mol%):0.6-27.5
Wollastonite (mol%):0.8-3.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):24.05
Type spec location:UWB
Main mass:H. Naji
Comments:Work name 400-A; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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