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Northwest Africa 13401
Basic information Name: Northwest Africa 13401
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13401
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 67 g
Meteoritical Bulletin:  MB 109  (2021)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 329 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 13401 (NWA 13401)

(Northwest Africa)

Purchased: January 2020

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Two stones with near absent fusion crust.

Petrography: (Daniel Sheikh, FSU) Sample is composed of maskelynite (Av. 750±100 µm, up to 2 mm, 40 vol%) and complexly zoned, tabular, and irregularly-shaped grains (some twinned) of subcalcic augite and pigeonite (Av. 400±50 µm, up to 1 mm, 60 vol%). Accessory phases include titanomagnetite, Si-Al-Na-K-rich glass, and pyrrhotite. Sample contains minor carbonate weathering veins.

Geochemistry: Subcalcic augite (Fs34.3±6.5Wo30.7±1.7, range Fs22.3-46.5Wo27.5-33.5, FeO/MnO=32±5, n=27), pigeonite (Fs49.2±7.0 Wo13.9±2.2, range Fs36.9-59.8Wo10.6-19.7, FeO/MnO=34±4, n=28), maskelynite (An45.5±4.5Or2.7±1.1, range An40.1-51.7Or1.3-4.6, n=23).

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

Specimens: 14 grams at UCLA; main mass with Jasper Spencer.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P January 2020
Mass (g):67
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):49.2±7.0, 34.3±6.5
Wollastonite (mol%):13.9±2.2, 30.7±1.7
Classifier:Daniel Sheikh, FSU
Type spec mass (g):14
Type spec location:UCLA
Main mass:Jasper Spencer
Comments:Submitted by Daniel Sheikh
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
References: Published in Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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Public domain photographs:
Daniel Sheikh      

     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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