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Northwest Africa 11251
Basic information Name: Northwest Africa 11251
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11251
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 266 g
Meteoritical Bulletin:  MB 106  (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 9 Jun 2017
Writeup from MB 106:

Northwest Africa 11251 (NWA 11251)

(Northwest Africa)

Purchased: 2016 Jan

Classification: Martian meteorite (Shergottite)

History: Purchased by Adam Aaronson in Temara, Morocco in January 2016.

Physical characteristics: A single stone (266 g) almost completely covered by black fusion crust. The fresh interior has an overall yellowish-green color.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Aphyric, medium-grained microgabbroic texture. Minerals are olivine, zoned pyroxene (pigeonite + augite), maskelynite, ilmenite, Ti-bearing chromite, pyrrhotite, Na-Mg-Fe-bearing merrillite and chlorapatite.

Geochemistry: (P. Carpenter, WUSL; S. Kuehner, UWS) Olivine (Fa46.5-47.4; FeO/MnO = 50-54, N = 3), pigeonite (Fs27.0-35.8Wo5.9-10.2, FeO/MnO = 30-34, N = 5), subcalcic augite (Fs21.8Wo32.6, FeO/MnO = 33), augite (Fs20.4Wo37.5, FeO/MnO = 30), maskelynite (An52.1-52.6Or2.1, N = 2).

Classification: Martian (shergottite, microgabbroic, olivine-bearing). This mafic aphyric shergottite is unusual in containing significant amounts of olivine.

Specimens: 20.2 g including one polished thin section at UWB; remainder with Aaronson.

Data from:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2016 Jan
Mass (g):266
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):46.5-47.4
Ferrosilite (mol%):27.0-35.8; 20.4-21.8
Wollastonite (mol%):5.9-10.2; 37.5-32.6
Classifier:A. Irving, P. Carpenter and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:A. Aaronson
Comments:Work name M1902; 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 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 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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