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Northwest Africa 10131
Basic information Name: Northwest Africa 10131
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10131
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 24.7 g
Meteoritical Bulletin:  MB 106  (2018)  Diogenite-pm
Recommended:  Diogenite-pm    [explanation]

This is 1 of 50 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 1 Mar 2017
Writeup from MB 106:

Northwest Africa 10131 (NWA 10131)

(Northwest Africa)

Purchased: 2014 Sep

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by John Curchin in September 2014 from a dealer at the Denver Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of mineral clasts of several types of orthopyroxene with subordinate olivine, clinopyroxene, anorthite and minor exsolved pigeonite and troilite in a finer grained matrix.

Geochemistry: Olivine (Fa38.9-39.4, FeO/MnO = 47-50, N = 2), orthopyroxene (Fs18.3Wo0.9; Fs20.8Wo1.3; Fs30.1Wo2.0; FeO/MnO = 29-33; N = 3), clinopyroxene (Fs46.7Wo42.0, FeO/MnO = 32).

Classification: Diogenite (polymict). The range of low-Ca pyroxene composition is too large for the breccia to be derived from a single diogenite precursor, hence the polymict attribution.

Specimens: 4.93 g including one polished thin section at UWB. The remaining material is held by Mr. J. Curchin.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2014 Sep
Mass (g):24.7
Shock stage:low
Weathering grade:low
Fayalite (mol%):38.9-39.4
Ferrosilite (mol%):18.3; 20.8; 30.1; 46.7
Wollastonite (mol%):0.9; 1.3; 2.0; 42.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):4.93
Type spec location:UWB
Main mass:J. Curchin
Comments:M1236; 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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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