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Northwest Africa 7955
Basic information Name: Northwest Africa 7955
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7955
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 95.1 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Diogenite-pm
Recommended:  Diogenite-pm    [explanation]

This is 1 of 38 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 14 Nov 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7955 (NWA 7955)

(Northwest Africa)

Purchased: 2013 Apr

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Steve Witt in April 2013 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively fresh fragmental breccia composed predominantly of angular diogenitic orthopyroxene grains. Minor components (<5 vol.%) include basaltic eucrite clasts, coarse pigeonite and calcic plagioclase grains derived from gabbroic eucrites, chromite, ilmenite and troilite and rare angular grains of olivine.

Geochemistry: Diogenitic orthopyroxene (Fs20.7Wo0.8; FeO/MnO = 33), olivine (Fa39.6, FeO/MnO =50; Fa47, FeO/MnO = 52), host orthopyroxene (Fs51.6Wo 3.1; FeO/MnO = 32), clinopyroxene exsolution lamellae (Fs26.5-30.6Wo39.7-40.8; FeO/MnO = 29-35).

Classification: Diogenite (polymict).

Specimens: 22.1 g and one polished thin section are at UWB. The remainder is held by Mr. S. Witt.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013 Apr
Mass (g):95.1
Pieces:3
Class:Diogenite-pm
Shock stage:low
Weathering grade:low
Fayalite (mol%):39.6; 47
Ferrosilite (mol%):20.7
Wollastonite (mol%):0.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.1
Type spec location:UWB
Main mass:S. Witt
Comments:SW13-2; 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:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alessandro Takeda   
Dave Johnson   
John A. Shea   
Michael S. Scherman   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2035 unapproved names)

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