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Northwest Africa 13204
Basic information Name: Northwest Africa 13204
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13204
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 76.8 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 298 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 29 Feb 2020
Writeup from MB 109:

Northwest Africa 13204 (NWA 13204)

(Northwest Africa)

Purchased: 2019 Oct

Classification: Martian meteorite (Shergottite)

History: Purportedly found in Morocco and purchased by Luc Labenne in October 2019 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture (mean grainsize 0.8 mm). Composed predominantly of zoned clinopyroxene and maskelynite with accessory alkali feldspar, silica polymorph, merrillite (Na-Mg-Fe bearing), pyrrhotite, ilmenite, Cr-ulvöspinel and rare baddeleyite. There are melt pockets consisting of vesicular, heterogeneous glassy material (sepia brown to pale yellow in thin section with streaky and swirly textures).

Geochemistry: Pigeonite cores (Fa33.3-37.5Wo9.3-12.2, FeO/MnO = 29-34, N = 4), subcalcic augite cores (Fs24.8-25.4Wo33.1-33.4, FeO/MnO = 29-30, N = 2), ferroan pigeonite rims (Fs44.6-59.0Wo12.8-16.6, FeO/MnO = 34-37, N = 5), maskelynite (An50.3-52.2Or1.4-2.0, N = 3), alkali feldspar in mesostasis (Or57.3Ab32.9An9.8).

Classification: Shergottite (diabasic).

Specimens: 15.4 g including one polished thin section at UWB; remainder with L. Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2019 Oct
Mass (g):76.8
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):33.3-37.5; 24.8-25.4; 52.3-59.0
Wollastonite (mol%):9.3-12.2; 33.1-33.4; 12.8-16.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):15.4
Type spec location:UWB
Main mass:L. Labenne
Comments:Work name LAB 241019; 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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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