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Northwest Africa 13038
Basic information Name: Northwest Africa 13038
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13038
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 587 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 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 13038 (NWA 13038)

(Northwest Africa)

Purchased: 2019 Nov

Classification: Martian meteorite (Shergottite)

History: Purchased by Mbark Arjdal from a dealer in Zouerat, Mauritania in November 2019.

Physical characteristics: A single stone (587 g) partly covered with black fusion crust and with several broken surfaces revealing the fresh light gray interior.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Relatively fine grained (mean grainsize 0.4 mm) and composed predominantly of polysynthetically-twinned, zoned clinopyroxene and maskelynite with accessory ilmenite, ulvöspinel (both Cr-bearing and Cr-free), chromite (with Ti-rich lamellae and rims), pyrrhotite, merrillite, chlorapatite and silica polymorph. One large orthopyroxene grain (2.5 mm across) with a pigeonite rim was found in the studied thin section. Sparse patches of pale glassy, vesicular impact melt and a thin darker veinlet of similar material were observed, as well as minor secondary calcite (as thin veinlets and vesicle linings).

Geochemistry: Pigeonite (Fs26.1-28.3Wo6.7-11.9, FeO/MnO = 29-30, N = 3), subcalcic augite (Fs20.4-21.4Wo34.1-31.5, FeO/MnO = 26-28, N = 2), ferropigeonite rims (Fs48.7-57.3Wo13.1-18.1, FeO/MnO = 37-38, N = 4), large orthopyroxene grain (Fs20.0Wo2.8, FeO/MnO = 29), pigeonite rim on large orthopyroxene grain (Fs31.5-39.2Wo12.6-19.2, FeO/MnO = 30-37, N = 2), maskelynite (An57.8-61.4Or1.7-1.3, N = 2).

Classification: Shergottite (aphyric, intersertal).

Specimens: 25.3 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Zouerat, Mauritania
Date:P 2019 Nov
Mass (g):587
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):26.1-28.3; 20.4-21.4; 48.7-57.3
Wollastonite (mol%):6.7-11.9; 34.1-31.5; 13.1-18.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.3
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj H4; 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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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