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Northwest Africa 7999
Basic information Name: Northwest Africa 7999
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7999
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 500 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 393 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 7999 (NWA 7999)

(Northwest Africa)

Purchased: 2013 Jul

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Adam Aaronson in Temara, Morocco in July 2013.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of basaltic eucrite clasts and related debris, plus ~5 vol.% of angular diogenitic orthopyroxene grains with concentric, ferroan rims. Eucritic material consists of exsolved pigeonite, calcic plagioclase, silica, fayalitic olivine, ilmenite, with minor baddeleyite, stained Ni-free metal and troilite.

Geochemistry: Host orthopyroxene (Fs59.8Wo2.6; FeO/MnO = 29), clinopyroxene exsolution lamellae (Fs25.1-29.0Wo38.5-40.6; FeO/MnO = 31-32), diogenitic orthopyroxene (Fs32.4Wo5.2; FeO/MnO = 28), olivine (Fa83.8-84.7; FeO/MnO = 39).

Classification: Eucrite (polymict).

Specimens: 21 g and one polished thin section are at UWB. The remainder is held by Aaronson.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2013 Jul
Mass (g):500
Pieces:many
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):59.8; 25.1-29.0
Wollastonite (mol%):2.6; 38.5-40.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21
Type spec location:UWB
Main mass:A. Aaronson
Comments:M1593; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
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)
Christophe PICQ      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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