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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
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 229 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 7 Jul 2020
Writeuphelp
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:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P January 2020
Mass (g):67
Pieces:2
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
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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