Meteoritical Bulletin: Entry for Northwest Africa 12539

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Northwest Africa 12539

Basic information

Name: Northwest Africa 12539
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12539
Observed fall: No
Year found: 2018
Country: Algeria
Mass: 516 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Diogenite
Recommended:			Diogenite [explanation]

This is 1 of 511 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 12 Apr 2019

Writeup

Writeup from MB 108:

Northwest Africa 12539 (NWA 12539)

Algeria

Purchased: 2018 Mar

Classification: HED achondrite (Diogenite)

History: Purportedly found in Algeria and purchased in Morocco in March 2018 by Lhcen Ouabicha and Zaid Sbitti.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed predominantly of angular grains of orthopyroxene (exhibiting undulose extinction) with typical grain size 800 μm, together with accessory clinopyroxene, calcic plagioclase, silica polymorph, chromite and troilite set in a sparse finer grained matrix (~5 vol.%). No metal was observed.

Geochemistry: Orthopyroxene (Fs_23.6-23.7Wo_2.6-1.9, FeO/MnO = 30-32, N = 3), clinopyroxene (Fs_6.9-7.7Wo_46.4-45.7, FeO/MnO = 25-28, N = 2), plagioclase (An_81.1-82.6Or_0.3, N = 2).

Classification: Diogenite (breccia).

Specimens: 25.1 g including one polished thin section at UWB; remainder with L. Ouabicha and Z. Sbitti.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2018 Mar
Mass (g):	516
Pieces:	1
Class:	Diogenite
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	23.6-23.7
Wollastonite (mol%):	2.6-1.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	25.1
Type spec location:	UWB
Main mass:	L. Ouabicha
Comments:	Work name LO18-D; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Robert Smart

Geography:

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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