Meteoritical Bulletin: Entry for Northwest Africa 12269

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Northwest Africa 12269

Basic information

Name: Northwest Africa 12269
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12269
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 1679 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Martian (shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 292 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 11 Dec 2018

Writeup

Writeup from MB 107:

Northwest Africa 12269 (NWA 12269)

(Northwest Africa)

Purchased: 2018 Jul

Classification: Martian meteorite (Shergottite)

History: Purchased in Ouarzazate, Morocco by Mohamed Aid in July 2018.

Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Relatively fine grained with intersertal texture. Composed predominantly of zoned clinopyroxene and maskelynite (some exhibiting a curved, narrow lath-like habit) with accessory fine grained intergrowths of hedenbergite+fayalite+silica, Fe-Ti oxides, merrillite and pyrrhotite.

Geochemistry: Subcalcic augite (Fs_24.8-41.8Wo_31.4-24.3, FeO/MnO = 30-33, N = 3), ferropigeonite (Fs_66.9-73.0Wo_16.6-16.5, FeO/MnO = 41-43, N = 2), maskelynite (An_51.9-53.1Or_1.3-1.2, N = 2).

Classification: Martian (shergottite, fine-intersertal)

Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. Aaronson.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Ouarzazate
Date:	P 2018 Jul
Mass (g):	1679
Pieces:	1
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	24.8-41.8
Wollastonite (mol%):	31.4-24.3
Classifier:	A. Irving, P. Carpenter, and S. Kuehner, UWS
Type spec mass (g):	20.5
Type spec location:	UWB
Main mass:	Aaronson
Comments:	Work name MA18-201; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Antonello Petriccione
Denis gourgues

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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