Meteoritical Bulletin: Entry for Northwest Africa 7939

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Northwest Africa 7939

Basic information

Name: Northwest Africa 7939
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7939
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 146.6 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	LL4-6
Recommended:			LL4-6 [explanation]

This is 1 of 91 approved meteorites classified as LL4-6. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 14 Oct 2013

Writeup

Writeup from MB 102:

Northwest Africa 7939 (NWA 7939)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Ordinary chondrite (LL4-6)

History: Purchased by Gary Fujihara in February 2013 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively fresh breccia composed of closely-packed clasts (exhibiting variable degree of recrystallization) plus some large, well-formed chondrules in a sparse fragmental matrix containing stained metal grains. Chondrule abundances in clasts range from sparse to rare. Olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, altered kamacite and troilite.

Geochemistry: Olivine (Fa_31.5-31.8), orthopyroxene (Fs_22.3-24.4Wo_0.7-1.6), clinopyroxene (Fs_8.9-9.1Wo_44.6-43.9).

Classification: Ordinary chondrite (LL4-6).

Specimens: 20.9 g and one polished thin section are at UWB. The remainder is held by Mr. G. Fujihara.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2013 Feb
Mass (g):	146.6
Pieces:	1
Class:	LL4-6
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	31.5-31.8
Ferrosilite (mol%):	22.3-24.4
Wollastonite (mol%):	0.7-1.6
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.9
Type spec location:	UWB
Main mass:	G. Fujihara
Comments:	GF13-2; 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)
Michael S. Scherman
Public domain photographs:
Gary Fujihara

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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