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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:help 146.6 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  LL4-6
Recommended:  LL4-6    [explanation]

This is 1 of 71 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
Writeuphelp
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 (Fa31.5-31.8), orthopyroxene (Fs22.3-24.4Wo0.7-1.6), clinopyroxene (Fs8.9-9.1Wo44.6-43.9).

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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
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Photos:
CreditPhotos
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 7483 approved meteorites from (Northwest Africa) (plus 1994 unapproved names)

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