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Northwest Africa 7943
Basic information Name: Northwest Africa 7943
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7943
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 593 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 344 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Nov 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7943 (NWA 7943)

(Northwest Africa)

Purchased: 2012 Feb

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Gary Fujihara in February 2012 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia dominated by angular shocked eucrite clasts and related mineral debris in a fairly coarse matrix. Extensive shock is manifested by conversion of plagioclase to spherulitic aggregates of fibrous, birefringent crystals. Moderate terrestrial weathering is indicated by the brown cores in some mafic silicates, stained opaque grains and minor barite in the matrix. Minerals are exsolved pigeonite, calcic plagioclase, ilmenite, Ti-bearing chromite, silica polymorph, sparse (~5 vol.%) diogenitic orthopyroxene, ferropigeonite and sparse olivine.

Geochemistry: Host low-Ca pyroxene (Fs51.5Wo5.6; FeO/MnO = 33), clinopyroxene lamellae (Fs22.4Wo41.4; FeO/MnO = 24), ferropigeonite (Fs57.6Wo7.4; FeO/MnO = 33), diogenitic orthopyroxene (Fs30.0Wo2.5; FeO/MnO = 28), olivine (Fa15.6, FeO/MnO = 44; Fa28.5, FeO/MnO = 50).

Classification: Eucrite breccia.

Specimens: 23 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 2012 Feb
Mass (g):593
Pieces:1
Class:Eucrite-pmict
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):15.6, 28.5
Ferrosilite (mol%):51.5; 22.4
Wollastonite (mol%):5.6; 41.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23
Type spec location:UWB
Main mass:G. Fujihara
Comments:GF13-6; 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:
Photos:
CreditPhotos
Public domain photographs:
Gary Fujihara   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7101 approved meteorites from (Northwest Africa) (plus 2004 unapproved names)

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