Meteoritical Bulletin: Entry for Northwest Africa 6971

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Northwest Africa 6971

Basic information

Name: Northwest Africa 6971
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6971
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 62 g

Classification
history:

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

This is 1 of 251 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 10 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 6971 (NWA 6971)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, monomict)

History: The meteorite was purchased in 2011 from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: Greyish individual partly covered with fusion crust.

Petrography: Coarse-grained basaltic breccia composed of up to 1.5 mm sized exsolved pyroxenes and calcic plagioclase. Minor phases include FeS, chromite, and silica. No metallic iron was found. Plagioclase is partly converted into maskelynite and the meteorite contains impact melt veins.

Geochemistry: low-Ca pyroxene: Fs_50.8±1.2Wo_4.0±1.6(Fs_48.9-53.2Wo_1.2-6.0, n=14, FeO/MnO=25-28); Ca-pyroxene: Fs_25.9±1.6Wo_38.8±1.6(Fs_22.4-29.0Wo_36.3-42.9, n=19, FeO/MnO=22-30); calcic plagioclase: An_93.1±0.7(An_91.9-94.0, n=15)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2011
Mass (g):	62
Pieces:	1
Class:	Eucrite-mmict
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	50.8; 25.9
Wollastonite (mol%):	4.0; 38.8
Classifier:	A. Greshake, MNB
Type spec mass (g):	12.8
Type spec location:	MNB
Main mass:	Stefan Ralew
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

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)
Andreas Grünemeyer

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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