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Northwest Africa 7276
Basic information Name: Northwest Africa 7276
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7276
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 380 g
Meteoritical Bulletin:  MB 101  (2012)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 605 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 18 Dec 2012
Writeup from MB 101:

Northwest Africa 7276 (NWA 7276)

(Northwest Africa)

Purchased: 2012

Classification: Ureilite

History: Purchased by Derik Bowers in 2012 from a dealer in Alnif, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate composed almost entirely of slightly stained olivine with some preferred grain orientation, rare pigeonite and opaque, metal-rich zones along grain boundaries. Several inclusions of oldhamite were found within olivine, and there is minor secondary calcite in addition to minor iron hydroxide alteration of metal.

Geochemistry: Olivine (cores Fa19.0-19.1, rim Fa13.5; Cr2O3 = 0.8 wt.%), pigeonite Fs16.3-16.7Wo5.9-5.8.

Classification: Ureilite (dunitic). This stone is unusual because it is composed predominantly of olivine with almost no pyroxene.

Specimens: 20 g of type material and one polished thin section are on deposit at UWB. The remaining material is held by Mr. D. Bowers.

Data from:
  Table 0
  Line 0:
Place of purchase:Alnif
Date:P 2012
Mass (g):380
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):19.0-19.1
Ferrosilite (mol%):16.3-16.7
Wollastonite (mol%):5.9-5.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWB
Main mass:D. Bowers
Comments:DB12-1; submitted by A. Irving
   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)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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