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Northwest Africa 6923
Basic information Name: Northwest Africa 6923
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6923
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 562 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 342 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Apr 2012
Writeuphelp
Writeup from MB 100:

Northwest Africa 6923 (NWA 6923)

(Northwest Africa)

Purchased: Jun 2011

Classification: HED achondrite (Eucrite, polymict)

Petrography: Very fresh specimen composed predominantly of cumulate eucrite debris and clasts, with minor basaltic eucrite and fine-grained eucritic-breccia clasts. Minerals include exsolved pigeonite (of at least two different types), calcic plagioclase, silica, ilmenite and troilite.

Geochemistry: Some exsolved pigeonite grains are composed of orthopyroxene (Fs52.1Wo2.5, Fe/Mn=34), with exsolution lamellae of clinopyroxene (Fs23.1Wo43.0, Fe/Mn=30), whereas other grains are composed of more magnesian orthopyroxene (Fs37.6Wo3.1, Fe/Mn=30) with exsolution lamellae of more magnesian clinopyroxene (Fs16.4Wo42.7, Fe/Mn=26).

Data from:
  MB100
  Table 1
  Line 1541:
Place of purchase:Temara
Date:P Jun 2011
Mass (g):562
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):52.1; 23.1; 37.6; 16.4
Wollastonite (mol%):2.5; 43.0; 3.1; 42.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21
Type spec location:UWS
Main mass:Aaronson
Comments: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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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