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Northwest Africa 13867
Basic information Name: Northwest Africa 13867
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13867
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 519 g
Recommended:  CO3    [explanation]

This is 1 of 616 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 20 Dec 2021
Writeup from MB 110:

Northwest Africa 13867 (NWA 13867)

(Northwest Africa)

Purchased: 2020 May

Classification: Carbonaceous chondrite (CO3)

History: Purchased by John Higgins in May, 2020 from a dealer in Adrar, Algeria.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very small chondrules (apparent diameter 210±150 µm, N = 22), mineral fragments and very fine grained CAI are set in a very dark matrix (~20 vol.%, deep reddish-brown to almost opaque in thin section) containing kamacite, taenite, troilite, pentlandite and minor secondary Ca sulfate. One studied CAI consists of perovskite, gehlenite, aluminous diopside, hibonite and orthopyroxene in a grossite matrix. There is also magnetite present

Geochemistry: Olivine Fa16.8±15.0, range Fa0.2-36.9, N=5. Cr2O3 in ferroan olivine 0.13-0.27 wt.% (N=5), low-Ca pyroxene (Fs19.7±24.9Wo2.8±2.3, range Fs1.0-54.5Wo0.6-5.8, N = 4), diopside (Fs1.5Wo35.6; Fs0.4Wo52.0; N = 2), plagioclase (An62.0Or0.1; An95.9Or0.1; N = 2).

Classification: Carbonaceous chondrite (CO3).

Specimens: 25.2 g including one polished thin section at UWB; remainder with Mr. J. Higgins.

Data from:
  Table 0
  Line 0:
Place of purchase:Adrar, Algeria
Date:P 2020 May
Mass (g):519
Shock stage:S2
Weathering grade:low
Fayalite (mol%):16.8±15.0 (n=5)
Ferrosilite (mol%):19.7±24.9
Wollastonite (mol%):2.8±2.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.2
Type spec location:UWB
Main mass:J. Higgins
Comments:Work name JH20-8; 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. 110, in preparation (2021)
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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