Meteoritical Bulletin: Entry for Northwest Africa 13362

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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: 4 g

Classification
history:

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

help

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 (Fs_66.4±12.6Wo_16.4±3.2, range Fs_42.3-85.2Wo_9.2-21.9, FeO/MnO=38±5, n=41), subcalcic augite (Fs_41.1±10.1Wo_30.1±3.0, range Fs_24.0-54.0Wo_26.4-36.6, FeO/MnO=34±5, n=14), maskelynite (An_47.9±4.4Or_2.0±0.9, range An_39.6-53.5Or_1.0-4.2, 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:
  MB109
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P January 2020
Mass (g):	4
Pieces:	1
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

Institutions
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)

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 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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