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Northwest Africa 7231
Basic information Name: Northwest Africa 7231
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7231
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 191 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 347 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Apr 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7231 (NWA 7231)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, polymict)

Petrography: The individuals are almost completely covered by a partly shiny black fusion crust; the interior appears dark-grayish with visible whitish plagioclase grains. It is composed of basaltic and melt clasts set into a clastic matrix of dominantly exsolved pyroxene and calcic plagioclase. Accessories include chromite, troilite, SiO2, and rare FeNi metal.

Geochemistry: opx: Fs19.8-63.9Wo2.1-6.4, FeO/MnO=27-33; cpx: Fs24.9-225.4Wo42.9-43.8, FeO/MnO=30-31; calcic plagioclase: An91.3 (range 76.7-94.7)

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2011
Mass (g):191
Pieces:8
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):19.8-63.9; 24.9-25.4
Wollastonite (mol%):2.1-6.4; 42.9-43.8
Classifier:A. Greshake, MNB
Type spec mass (g):20.8
Type spec location:MNB
Main mass:Stefan Ralew
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
bphd   
Gregor H.      
Mirko Graul            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7320 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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