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Northwest Africa 7470
Basic information Name: Northwest Africa 7470
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7470
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 107 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 8 Nov 2014
Writeup from MB 103:

Northwest Africa 7470 (NWA 7470)

(Northwest Africa)

Purchased: 2009 Sep

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Andrew Abraham in September 2009 from a Moroccan dealer at the Denver Mineral Show.

Physical characteristics: A complete stone (107 g) coated by black fusion crust. The interior consists of closely packed, angular, pale-gray clasts.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of eucrite clasts and related crystal debris. Minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, chromite, Ti-chromite and troilite. Some pyroxene and plagioclase is intergrown in a symplectitic texture.

Geochemistry: Host orthopyroxene (Fs62.3-63.0Wo2.0-2.1; FeO/MnO = 32-33, N = 3), clinopyroxene exsolution lamellae (Fs26.6-27.6Wo44.1-44.3; FeO/MnO = 34-36).

Classification: Eucrite (monomict breccia).

Specimens: A total of 20.8 g of material is on deposit at UWB. A. Abraham holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2009 Sep
Mass (g):107
Shock stage:low
Weathering grade:low
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.8
Type spec location:UWB
Main mass:A. Abraham
Comments:AAb12-1; 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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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