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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:help 267 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 26 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 16 Nov 2019
Writeuphelp
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 Fs64.1±1.5Wo2.5±1.0, FeO/MnO 33.6±3.0 (n=5). Augite exsolution Fs293Wo42.6 (n=1). Plagioclase An89.6±0.6Ab9.9±0.7Or0.5±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 29 Oct 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1419 approved meteorites from Morocco (plus 15 unapproved names) (plus 1 impact crater)

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