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Northwest Africa 7431
Basic information Name: Northwest Africa 7431
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7431
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 158 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  H4
Recommended:  H4    [explanation]

This is 1 of 6038 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 9 Jul 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 7431 (NWA 7431)

(Northwest Africa)

Purchased: 2006 Feb

Classification: Ordinary chondrite (H4)

History: Purchased by Dr. David Gregory in February 2008 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, relatively small chondrules in a relatively coarse grained matrix containing altered metal.

Geochemistry: Olivine (Fa18.5-18.6, N = 3), orthopyroxene (Fs16.1-16.4Wo1.9-1.0, N = 3), clinopyroxene (Fs7.1Wo35.9; Fs5.8Wo46.1; N = 2).

Classification: Ordinary chondrite (H4).

Specimens: 21 g plus one polished thin section at ROM; remainder with DGregory.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2006 Feb
Mass (g):158.0
Pieces:4
Class:H4
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):18.5-18.6
Ferrosilite (mol%):16.1-16.4
Wollastonite (mol%):1.9-1.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21
Type spec location:ROM
Main mass:DGregory
Comments:DG271009-1; submitted by A. Irving
Institutions
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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