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Northwest Africa 7457
Basic information Name: Northwest Africa 7457
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7457
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 15.5 kg
Meteoritical Bulletin:  MB 102  (2013)  L5-melt breccia
Recommended:  L5-melt breccia    [explanation]

This is 1 of 30 approved meteorites classified as L5-melt breccia.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 6 Sep 2013
Writeup from MB 102:

Northwest Africa 7457 (NWA 7457)

(Northwest Africa)

Purchased: 2012 Aug

Classification: Ordinary chondrite (L5, melt breccia)

History: Purchased by Aaronson in 2011 November in Temara, Morocco.

Petrography: Clasts of L5 chondrite material containing sparse chondrules are present within a shock-darkened matrix containing ragged, variably-sized grains of Fe-Ni metal. Olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, altered kamacite and troilite.

Geochemistry: Olivine (Fa25.3-25.4), orthopyroxene (Fs20.2-20.6Wo1.3-1.4), clinopyroxene (Fs7.4-8.1Wo45.1-43.7).

Classification: Ordinary chondrite (L5-melt breccia).

Data from:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2012 Aug
Mass (g):15500
Class:L5-melt breccia
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):25.3-25.4
Ferrosilite (mol%):20.2-20.6
Wollastonite (mol%):1.3-1.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):38
Type spec location:UWB
Main mass:A. Aaronson
Comments:M1403; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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