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Northwest Africa 7894
Basic information Name: Northwest Africa 7894
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7894
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 36.6 g
Meteoritical Bulletin:  MB 102  (2013)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 481 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 25 Jun 2013
Writeup from MB 102:

Northwest Africa 7894 (NWA 7894)

(Northwest Africa)

Purchased: Jan 2011

Classification: HED achondrite (Diogenite)

History: Bought on eBay in April 2012 from a seller who traded it as a single stone in January 2011.

Physical characteristics: A single broken stone, ~70% covered by shiny fusion crust. Broken surface reveal a grayish interior with greenish, whitish and dark clasts up to a few mm in size set in a light-gray matrix.

Petrography: (J. Gattacceca, CEREGE): Breccia composed predominantly of diogenitic material and less than 10 vol. % of basaltic eucrite clasts up to 2 mm. The dominant minerals are orthopyroxene, plagioclase, olivine. Silica, chromite, and troilite. Rare metal.

Geochemistry: Orthopyroxene Fs23.5±2.6 Wo2.4±0.7 FeO/MnO=30.3, Plagioclase An89.7Or0.3, Olivine Fa 40.9±0.9 FeO/MnO = 51.0. Chromite Cr/(Cr+Al)= 0.79

Classification: HED achondrite (diogenite, polymict breccia). Minimal weathering.

Specimens: 9 g and a polisehd section at CEREGE. Main mass with R. Lenssen.

Data from:
  Table 0
  Line 0:
Date:P Jan 2011
Mass (g):36.6
Weathering grade:minimal
Fayalite (mol%):40.9±0.9
Ferrosilite (mol%):23.5±2.6
Wollastonite (mol%):2.4±0.7
Magnetic suscept.:2.78
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):9
Type spec location:CEREGE
Main mass:R. Lenssen
Comments:Submitted by J. Gattacceca
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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