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Northwest Africa 13237
Basic information Name: Northwest Africa 13237
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13237
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 36.5 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 5 Apr 2020
Writeup from MB 109:

Northwest Africa 13237 (NWA 13237)

(Northwest Africa)

Purchased: 2014

Classification: Martian meteorite (Shergottite)

History: Purchased by John Humphries at the Sainte-Marie-aux-Mines Mineral Show in France, July 2014.

Physical characteristics: Black fusion crust exterior. Saw cuts reveal a light-gray color, with medium-grained pyroxene grains, many of which are lath shaped. Scattered shiny maskelynite patches and dark oxide grains are visible. A few thin, dark, shock melt veins are present.

Petrography: (C. Agee, UNM) EPMA images show ~70% igneous-zoned pyroxene and ~20% maskelynite. Ubiquitous Ti-magnetite, ilmenite, Fe-sulfide, silica and apatite observed.

Geochemistry: (C. Agee, UNM) Pigeonite Fs51.6±6.6Wo14.0±2.0, Fe/Mn=36±1, n=13; augite Fs38.1±4.2Wo32.7±3.9, Fe/Mn=37±1, n=2; maskelynite An39.9±1.0, Ab57.4±1.3, Or 2.7±0.6, n=2.

Classification: Martian basaltic shergottite

Specimens: 7.36 g on deposit at UNM, John Humphries holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:France
Date:P 2014
Mass (g):36.46
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):51.6±6.6; 38.1±4.2
Wollastonite (mol%):14.0±2.0; 32.7±3.9
Classifier:C. Agee, UNM
Type spec mass (g):7.36
Type spec location:UNM
Main mass:John Humphries
Comments:Submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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