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Northwest Africa 13477
Basic information Name: Northwest Africa 13477
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13477
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 777 g
Recommended:  CO3    [explanation]

This is 1 of 642 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 11 Nov 2020
Writeup from MB 109:

Northwest Africa 13477 (NWA 13477)

(Northwest Africa)

Purchased: 2020 Jun

Classification: Carbonaceous chondrite (CO3)

History: Purchased by John Higgins in June 2020 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Abundant well-formed chondrules (apparent diameter 260±150 µm, N = 24) together with subordinate very fine grained CAI and mineral fragments are set in a relatively sparse fine grained matrix (~15 vol.%, orange-brown in thin section) containing troilite, kamacite and taenite.

Geochemistry: Olivine (Fa21.7±17.1, range Fa2.8-38.8, N = 4; Cr2O3 in ferroan olivine 0.03-0.46 wt.%, mean 0.12±0.15 wt.%, N = 8), low-Ca pyroxene (Fs16.6±0.2Wo1.6±1.3, range Fs16.4-16.6Wo1.0-3.9, N = 5), clinopyroxene (Fs7.8±0.6Wo37.8±2.6, range Fs7.3-8.5Wo35.2-40.3, N = 3).

Classification: Carbonaceous chondrite (CO3).

Specimens: 22.4 g including one polished thin section at UWB; remainder with Mr. J. Higgins.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2020 Jun
Mass (g):777
Shock stage:S2
Weathering grade:low
Fayalite (mol%):21.7±17.1
Ferrosilite (mol%):16.6±0.2
Wollastonite (mol%):1.6±1.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):22.4
Type spec location:UWB
Main mass:J. Higgins
Comments:JH20-4; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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