Meteoritical Bulletin: Entry for Northwest Africa 13401

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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: 67 g

Classification
history:

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 7 Jul 2020

Writeup

help

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 (Fs_34.3±6.5Wo_30.7±1.7, range Fs_22.3-46.5Wo_27.5-33.5, FeO/MnO=32±5, n=27), pigeonite (Fs_49.2±7.0Wo_13.9±2.2, range Fs_36.9-59.8Wo_10.6-19.7, FeO/MnO=34±4, n=28), maskelynite (An_45.5±4.5Or_2.7±1.1, range An_40.1-51.7Or_1.3-4.6, 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:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
Daniel Sheikh

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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