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Northwest Africa 7997
Basic information Name: Northwest Africa 7997
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7997
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 60 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 455 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 14 Nov 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7997 (NWA 7997)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Diogenite)

History: Purchased by Terry Boswell in 2011 from a dealer in Midelt, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh specimen composed of interlocking grains of clear orthopyroxene with accessory olivine, chromite and troilite. The mafic silicates have variable composition from grain to grain.

Geochemistry: Orthopyroxene (Fs23.8Wo1.6; Fs25.3Wo3.2; FeO/MnO = 28-30), olivine (Fa25.1; Fa28.6; FeO/MnO = 44).

Specimens: 12 g and one polished thin section are at UWB. The remainder is held by Mr. T. Boswell.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Midelt
Date:P 2011
Mass (g):60
Pieces:1
Class:Diogenite
Shock stage:low
Weathering grade:low
Fayalite (mol%):25.1; 28.6
Ferrosilite (mol%):23.8; 25.3
Wollastonite (mol%):1.6; 3.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12
Type spec location:UWB
Main mass:T. Boswell
Comments:TB13-10; 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:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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