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Northwest Africa 13187
Basic information Name: Northwest Africa 13187
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13187
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1600 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 213 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 29 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13187 (NWA 13187)

(Northwest Africa)

Purchased: 2019 Sep

Classification: Martian meteorite (Shergottite)

History: Purchased by Mark Lyon in September 2019 from a Moroccan dealer. Some of this material was subsequently sold to Mike Fleeman and Roberto Vargas.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture. Composed predominantly of zoned clinopyroxene and maskelynite with accessory ulvöspinel (some Cr-bearing), ilmenite, silica polymorph, merrillite, pyrrhotite and minor secondary calcite.

Geochemistry: Subcalcic augite cores (Fs20.3-23.3Wo36.2-32.0, FeO/MnO = 28-29, N = 4), ferroan pigeonite rims (Fs52.4-59.2Wo14.2-19.7, FeO/MnO = 36-39, N = 4), maskelynite (An50.5-57.2Or1.9-0.7, N = 3).

Classification: Shergottite (diabasic).

Specimens: 20.1 g including one polished thin section at UWB; remainder held by Mr. M. Lyon, Mr. M. Fleeman (550 g) and Mr. R. Vargas (50 g).

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Sep
Mass (g):1600
Pieces:2
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):20.3-23.3; 52.4-59.2
Wollastonite (mol%):36.2-32.0; 14.2-19.7
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.1
Type spec location:UWB
Main mass:M. Lyon/M. Fleeman/R. Vargas
Comments:Work name Lyon19-2; 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 7228 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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