Meteoritical Bulletin: Entry for Northwest Africa 7957

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Northwest Africa 7957

Basic information

Name: Northwest Africa 7957
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7957
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 86.1 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	CO3
Recommended:			CO3 [explanation]

This is 1 of 645 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 18 Nov 2013

Writeup

Writeup from MB 102:

Northwest Africa 7957 (NWA 7957)

(Northwest Africa)

Purchased: 2013 Apr

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Steve Witt from a Moroccan dealer in April 2013.

Petrography: (A. Irving and S. Kuehner, UWS) Small (0.2-0.6 mm), well-formed chondrules plus sparse mineral fragments and fine grained CAI (some containing hibonite) in a brown matrix.

Geochemistry: Olivine (Fa_1.2-47.4; Cr₂O₃ in ferroan examples is 0.09-0.14 wt.%, mean 0.12 wt.%, s.d. 0.02 wt.%, N = 7), orthopyroxene (Fs_1.4-6.7Wo_3.5-3.3), subcalcic augite (Fs_1.1-1.4Wo_37.7-28.9).

Classification: Carbonaceous chondrite (CO3). Subtype is estimed to be 3.5 on the basis of the narrow distribution of Cr₂O₃ in ferroan olivine.

Specimens: 19.7 g and one polished thin section are at UWB. The remainder is held by Mr. S. Witt.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2013 Apr
Mass (g):	86.1
Pieces:	1
Class:	CO3
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	1.2-47.4 (n=9)
Ferrosilite (mol%):	1.4-6.7
Wollastonite (mol%):	3.5-3.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	19.7
Type spec location:	UWB
Main mass:	S. Witt
Comments:	SW13-4; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Suzanne De Paula

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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