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Northwest Africa 7990
Basic information Name: Northwest Africa 7990
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7990
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 452 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  LL7
Recommended:  LL7    [explanation]

This is 1 of 60 approved meteorites classified as LL7.   [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 7990 (NWA 7990)

(Northwest Africa)

Purchased: 2010

Classification: Ordinary chondrite (LL7)

History: Purchased by Terry Boswell in 2010 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Completely recrystallized with no chondrules. Olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, stained kamacite and troilite.

Geochemistry: Olivine (Fa32.5-33.0), orthopyroxene (Fs26.3-26.4Wo2.6-1.9), clinopyroxene (Fs10.4-11.5Wo44.1-43.1).

Classification: Ordinary chondrite (LL7).

Specimens: 26 g and one polished thin section are at UWB. The remainder is held by Aaronson.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2010
Mass (g):452
Pieces:1
Class:LL7
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):32.5-33.0
Ferrosilite (mol%):26.3-26.4
Wollastonite (mol%):2.6-1.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26
Type spec location:UWB
Main mass:T. Boswell
Comments:TB13-2; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2035 unapproved names)

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