Meteoritical Bulletin: Entry for Northwest Africa 6964

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Northwest Africa 6964

Basic information

Name: Northwest Africa 6964
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6964
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 93 g

Classification
history:

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

This is 1 of 272 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 6964 (NWA 6964)

(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: 41 up to 2 cm sized individuals most of which partly to completely covered by fusion crust.

Petrography: Monomict basaltic breccia predominantly composed of up to 400 µm sized exsolved pyroxenes and often lath-shaped calcic plagioclase. Minor phases include FeS, chromite, ilmenite, and silica. No metallic iron was found. The meteorite contains impact melt veins.

Geochemistry: low-Ca pyroxene: Fs_59.9±0.7Wo_2.6±0.8(Fs_58.1-60.6Wo_1.8-4.4, n=15, FeO/MnO=29-31); Ca-pyroxene: Fs_26.5±0.4Wo_43.7±0.6(Fs_25.7-27.5Wo_42.1-44.5, n=30, FeO/MnO=26-34); calcic plagioclase: An_90.1±0.6(An_89.1-91.6, n=15)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2011
Mass (g):	93
Pieces:	41
Class:	Eucrite-mmict
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	59.9; 26.5
Wollastonite (mol%):	2.6; 43.7
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.6
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

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)
Gregor H.

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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