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Northwest Africa 11214
Basic information Name: Northwest Africa 11214
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11214
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 477 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 26 Apr 2017
Writeup from MB 106:

Northwest Africa 11214 (NWA 11214)

(Northwest Africa)

Purchased: 2017 Jan

Classification: Martian meteorite (Shergottite)

History: Purchased by Adam Aaronson in Temara, Morocco in January 2017.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Poikilitic texture. Large pyroxene oikocrysts (exhibiting undulose extinction) enclose chadacrysts of olivine (also exhibiting undulose extinction) and Ti-free, Al-poor chromite. Accessory phases are ~5 vol.% interstitial maskelynite and minor pyrrhotite. Pockets of dark brown shock glass containing acicular microlites of olivine and pyroxene are prevalent in this specimen, and these are crosscut by anastomozing veinlets of a second generation of shock glass that is much paler brown in thin section.

Geochemistry: (P. Carpenter, WUSL; S. Kuehner, UWS) The mafic silicates have very narrow ranges in composition. Olivine (Fa25.5-27.6, FeO/MnO = 47-52, N = 2), orthopyroxene (Fs20.6-21.2Wo3.2-3.9, FeO/MnO = 29, N = 2), maskelynite (An50.9-53.7Or1.4-1.3, N = 2).

Classification: Martian (shergottite, poikilitic).

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 2017 Jan
Mass (g):477
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):25.5-27.6
Ferrosilite (mol%):20.6-21.2
Wollastonite (mol%):3.2-3.9
Classifier:A. Irving and P. Carpenter, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:A. Aaronson
Comments:Work name M1944; 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 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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