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Northwest Africa 13731
Basic information Name: Northwest Africa 13731
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13731
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 2 kg
Recommended:  H3    [explanation]

This is 1 of 670 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 6 Feb 2021
Writeup from MB 110:

Northwest Africa 13731 (NWA 13731)


Purchased: 2019

Classification: Ordinary chondrite (H3)

History: Purchased by Jesper Grønne in 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, relatively small glass-bearing chondrules (apparent diameter 320±200 µm, N=24) are set in a recrystallized matrix containing altered metal, troilite, chlorapatite, taenite and chromite.

Geochemistry: Olivine (Fa18.6±2.5, range Fa13.9-22.1, Cr2O3 < 0.05 wt.%, N = 7), low-Ca pyroxene (Fs17.4±5.2Wo1.2±1.0, range Fs13.8-26.5Wo0.2-2.7, N = 5), subcalcic augite (Fs18.6±9.8Wo31.2±1.1, range Fs11.7-25.5Wo30.4-32.0, N = 2).

Classification: Ordinary chondrite (H3). This specimen is unequilibrated but of high petrologic subtype.

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

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):2000
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):18.6±2.5
Ferrosilite (mol%):17.4±5.2
Wollastonite (mol%):1.2±1.0
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.5
Type spec location:UWB
Main mass:J. Grønn
Comments:Work name JG 048; 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 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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