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Northwest Africa 13227
Basic information Name: Northwest Africa 13227
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13227
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 2.3 kg
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 260 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 5 Apr 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13227 (NWA 13227)

(Northwest Africa)

Purchased: 2019 Nov

Classification: Martian meteorite (Shergottite)

History: Purchased by Mark Lyon in November 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Coarse grained (gabbroic) assemblage of zoned clinopyroxene (up to 3.5 mm), olivine (some as inclusions in clinopyroxene) and curvilinear, lath-like maskelynite (~15 vol.%), together with accessory Mg-ilmenite, Cr-ulvöspinel, pyrrhotite, baddeleyite, merrillite and chlorapatite. Minor veinlets of secondary calcite are present.

Geochemistry: Olivine (Fa35.5-51.6, FeO/MnO = 50-55, N = 11), pigeonite cores (Fs25.6-28.2Wo5.2-9.3, FeO/MnO = 28-33, N = 6), subcalcic augite rims (Fs21.5-21.6Wo31.3-31.8; Fs28.0Wo26.9; FeO/MnO = 27-30, N = 3), pigeonite rims (Fs34.6-36.6Wo12.3-15.7, FeO/MnO = 30-33, N = 3), maskelynite (An51.7-57.1Or1.8-2.8, N = 4).

Classification: Shergottite (olivine gabbroic).

Specimens: 21.6 g including one polished thin section at UWB; remainder with Mr. M. Lyon.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Nov
Mass (g):2300
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):35.5-51.6
Ferrosilite (mol%):25.6-28.2; 21.5-21.6; 34.6-36.6
Wollastonite (mol%):5.2-9.3; 31.3-31.8; 12.3-15.7
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.6
Type spec location:UWB
Main mass:M. Lyon
Comments:Work name Lyon19-3; submitted by A. Irving
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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