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Northwest Africa 7318
Basic information Name: Northwest Africa 7318
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7318
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 420 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 515 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 10 Apr 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 7318 (NWA 7318)

Northwest Africa

Purchased: 2012 Apr

Classification: Ureilite

History: Purchased in Temara, Morocco by Adam Aaronson in April 2012.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate of olivine (~70 vol.%) and pigeonite (~30 vol.%), exhibiting some preferred orientation of grains of both phases. Fine grained metal occurs in irregular zones along olivine grain boundaries (and as blebs in their magnesian, reduced margins).

Geochemistry: Olivine (cores Fa20.1-22.0; Cr2O3 = 0.71-0.74 wt.%; N = 3), pigeonite (Fs18.0-18.1Wo9.4-9.5, N = 2)

Classification: Ureilite.

Specimens: 20 g including one polished thin section at UWB. The remaining material is held by Aaronson.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2012 Apr
Mass (g):420
Pieces:1
Class:Ureilite
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):20.1-22.0
Ferrosilite (mol%):18.0-18.1
Wollastonite (mol%):9.4-9.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWB
Main mass:Aaronson
Comments:M1376; 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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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