Meteoritical Bulletin: Entry for Northwest Africa 12958

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Northwest Africa 12958

Basic information

Name: Northwest Africa 12958
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12958
Observed fall: No
Year found: 2019
Country: Morocco
Mass: 267 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 97 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 16 Nov 2019

Writeup

Writeup from MB 108:

Northwest Africa 12958 (NWA 12958)

Morocco

Purchased: 2019

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased in Morocco in 2019.

Physical characteristics: Dark brecciated stone. Cut surface reveals a dark-gray interior with light, cm sized clasts.

Petrography: (J. Gattacceca, CEREGE) Brecciated fine-grained igneous rock with lithic clasts set in a melt rock matrix. Main minerals are plagioclase and pyroxene (some with augite exsolutions). Other minerals: rare metal (up to 50 µm), troilite, ilmenite, silica polymorph, chromite.

Geochemistry: Low-Ca pyroxene Fs_64.1±1.5Wo_2.5±1.0, FeO/MnO 33.6±3.0 (n=5). Augite exsolution Fs₂₉₃Wo_42.6(n=1). Plagioclase An_89.6±0.6Ab_9.9±0.7Or_0.5±0.4(n=3). Chromite Cr# 0.84 (n=1).

Classification: Achondrite (eucrite melt breccia).

Specimens: Type specimen at CEREGE. Main mass with Isabelle Pothier.

Data from:
  MB108
  Table 0
  Line 0:

Date:	P 2019
Mass (g):	267
Pieces:	several
Class:	Eucrite-melt breccia
Ferrosilite (mol%):	64.1±1.5 (n=5)
Wollastonite (mol%):	2.5±1.0
Magnetic suscept.:	3.46
Classifier:	J. Gattacceca, CEREGE
Type spec mass (g):	27.9
Type spec location:	CEREGE
Main mass:	Isabelle Pothier
Comments:	work name CM29; submitted by Jérôme Gattacceca

Institutions
and collections

CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)

Catalogs:

References:

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

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Geography:

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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