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Northwest Africa 12262
Basic information Name: Northwest Africa 12262
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12262
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 3.29 kg
Meteoritical Bulletin:  MB 107  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 Dec 2018
Writeup from MB 107:

Northwest Africa 12262 (NWA 12262)

(Northwest Africa)

Purchased: 2018 Jul

Classification: Martian meteorite (Shergottite)

History: Purchased in Ouarzazate, Morocco by Mohamed Aid in July 2018.

Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Medium-grained with diabasic texture and some small, dark glassy shock melt pockets. Composed predominantly of zoned clinopyroxene and maskelynite with accessory fine grained intergrowths of hedenbergite+fayalite+silica, Fe-Ti oxide (finely exsolved), merrillite and pyrrhotite.

Geochemistry: Subcalcic augite (Fs28.5-30.6Wo28.2-23.7, FeO/MnO = 30, N = 2), pigeonite (Fs41.3Wo15.5, FeO/MnO = 31), ferropigeonite (Fs71.1-83.4Wo17.1-11.3, FeO/MnO = 38-45, N = 4), maskelynite (An50.9-52.1Or2.1, N = 2).

Classification: Martian (shergottite, diabasic)

Specimens: 26.3 g including one polished thin section at UWB; remainder with Aaronson.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2018 Jul
Mass (g):3294
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):28.5-30.6
Wollastonite (mol%):28.2-23.7
Classifier:A. Irving, P. Carpenter, and S. Kuehner, UWS
Type spec mass (g):26.3
Type spec location:UWB
Main mass:A. Aaronson
Comments:Work name MA18-200; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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