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Northwest Africa 7270
Basic information Name: Northwest Africa 7270
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7270
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 863 g
Meteoritical Bulletin:  MB 102  (2013)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Sep 2013
Writeup from MB 102:

Northwest Africa 7270 (NWA 7270)

(Northwest Africa)

Purchased: 2012 Feb

Classification: HED achondrite (Eucrite)

History: Purchased by GHupé in 2012 February from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Complex fragmental breccia composed mainly of shocked gabbroic eucrite clasts and some dark, fine grained, quench-textured eucrite clasts in a sparse fragmental matrix. Gabbroic eucrite clasts consist predominantly of pyroxenes and calcic plagioclase (exhibiting spherulitic texture of lamellar birefringent subgrains). The specimen exhibits orange staining from terrestrial weathering of minor metal.

Geochemistry: Orthopyroxene (Fs19.5Wo1.3; Fs36.3Wo2.0; Fs53.7Wo5.7; FeO/MnO = 29-33), pigeonite (Fs47.5Wo19.1; Fs52.9Wo8.7; FeO/MnO = 31-32), augite (Fs25.0Wo40.9; FeO/MnO = 28).

Classification: Eucrite, polymict.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2012 Feb
Mass (g):863
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):19.5; 36.3; 53.7; 47.5; 52.9; 25.0
Wollastonite (mol%):1.3; 2.0; 5.7; 19.1; 8.7; 40.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWB
Main mass:G. Hupe
Comments:GH-427; 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)
Hupe: (old address—now see GHupé or AHupé) G. and A. Hupe, 2616 Lake Youngs Court SE, Renton, WA 98058., United States (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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