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Northwest Africa 13243
Basic information Name: Northwest Africa 13243
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13243
Observed fall: No
Year found: 2020
Country: Libya
Mass:help 245 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 221 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 28 Mar 2020
Writeup from MB 109:

Northwest Africa 13243 (NWA 13243)


Purchased: 2020 Jan

Classification: Martian meteorite (Shergottite)

History: A group of 20 similar-appearing stones found together in Libya was purchased by Mbark Arjdal in January 2020 from a Libyan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Relatively fine grained (mean grainsize 0.5 mm) aphyric assemblage of predominantly zoned clinopyroxene and maskelynite with accessory merrillite, ilmenite, ulvöspinel, pyrrhotite, alkali feldspar and rare silica polymorph. Sparse pockets of vesicular shock glass are present; in thin section these appear pale brown with a swirly texture and contain opaque inclusions.

Geochemistry: Subcalcic augite (Fs20.6-25.7Wo35.9-27.9, FeO/MnO = 28-30, N = 4), pigeonite (Fs35.9-27.9Wo12.8-17.3, FeO/MnO = 35-38, N = 6), maskelynite (An56.8-60.6Or1.7-1.1, N = 4).

Classification: Shergottite (aphyric).

Specimens: 22.7 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2020 Jan
Mass (g):244.5
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):20.6-25.7; 37.0-52.5
Wollastonite (mol%):35.9-27.9; 12.8-17.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSTL
Type spec mass (g):22.7
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM0; 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)
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     This is 1 of 1498 approved meteorites from Libya (plus 22 unapproved names) (plus 2 impact craters)

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