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Northwest Africa 13115
Basic information Name: Northwest Africa 13115
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13115
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1524 g
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 Feb 2020
Writeup from MB 109:

Northwest Africa 13115 (NWA 13115)

(Northwest Africa)

Purchased: 2019 Nov

Classification: Martian meteorite (Shergottite)

History: The stone was acquired in 2019 in Temara, Morocco, by Adam Aaronson and in November 2019 sold to ArtAncient, London.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture with some lattice preferred orientation of elongate prismatic zoned clinopyroxene and lath-like maskelynite grains. Accessory phases include ilmenite, ulvöspinel, merrillite, baddeleyite, pyrrhotite (some with secondary Fe hydroxide staining), silica polymorph and rare fayalite (as inclusions in ulvöspinel and as rim on ilmenite).

Geochemistry: Pigeonite cores (Fa32.0-34.4Wo11.3-12.0, FeO/MnO = 31-35, N = 4), subcalcic augite cores (Fs24.6-24.8Wo32.3-31.3; FeO/MnO = 28-30, N = 2), ferroan pigeonite rims (Fs45.8-64.2Wo12.5-19.3, FeO/MnO = 33-37, N = 6), fayalite (Fa87.5-88.8, FeO/MnO = 52-55, N = 2), maskelynite (An52.0-56.5Or1.3-0.9, N = 3), maskelynite in mesostasis (An49.0Or4.2).

Classification: Shergottite (diabasic).

Specimens: 21.0 g including one polished thin section at UWB; main mass with ArtAncient (Chelsea Creek, London, UK).

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2019 Nov
Mass (g):1524
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):87.5-88.8
Ferrosilite (mol%):32.0-32.4; 24.6-24.8; 45.8-64.2
Wollastonite (mol%):11.3-12.0; 32.3-31.3; 12.5-19.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.0
Type spec location:UWB
Main mass:ArtAncient
Comments:Work name M2222; 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 Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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