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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 621 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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