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Northwest Africa 13362
Basic information Name: Northwest Africa 13362
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13362
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 4 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 289 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 7 Jul 2020
Writeup from MB 109:

Northwest Africa 13362 (NWA 13362)

(Northwest Africa)

Purchased: January 2020

Classification: Martian meteorite (Shergottite)

History: Purchased in January 2020 by Jasper Spencer from a moroccan dealer.

Physical characteristics: One stone covered by a dull, dark-colored fusion crust.

Petrography: (Daniel Sheikh, FSU) Sample is predominantly composed of slightly oriented maskelynite laths (Av. 900±50 µm, up to 3 mm, 65 vol%) and complexly zoned, tabular, rounded, and irregularly-shaped grains (some twinned) of ferropigeonite and subcalcic augite (Av. 350±50 µm, up to 1mm, 35 vol%). Accessory phases include titanomagnetite, ulvöspinel, Si-Al-K-Na rich glass, merrillite, chlorapatite, and pyrrhotite. Sample contains minor carbonate weathering veins.

Geochemistry: Ferropigeonite (Fs66.4±12.6Wo16.4±3.2, range Fs42.3-85.2Wo9.2-21.9, FeO/MnO=38±5, n=41), subcalcic augite (Fs41.1±10.1Wo30.1±3.0, range Fs24.0-54.0Wo26.4-36.6, FeO/MnO=34±5, n=14), maskelynite (An47.9±4.4Or2.0±0.9, range An39.6-53.5Or1.0-4.2, n=28).

Classification: Martian (shergottite) Silicate chemistry, the presence of maskelynite, and FeO/MnO ratios of pyroxenes provide support for classification as shergottite.

Specimens: 1 gram at App; main mass with Jasper Spencer.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P January 2020
Mass (g):4
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):66.4±12.6, 41.1±10.1
Wollastonite (mol%):16.4±3.2, 30.1±3.0
Classifier:Daniel Sheikh, FSU
Type spec mass (g):1
Type spec location:App
Main mass:Jasper Spencer
Comments:Submitted by Daniel Sheikh
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Public domain photographs:
Daniel Sheikh   

     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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