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Northwest Africa 7815
Basic information Name: Northwest Africa 7815
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7815
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 146 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CO3.1
Recommended:  CO3.1    [explanation]

This is 1 of 13 approved meteorites classified as CO3.1.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 12 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7815 (NWA 7815)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Carbonaceous chondrite (CO3.1)

History: Purchased by GHupé in February 2013 from a dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Composed of very small, well-formed chondrules plus sparse, fine-grained CAIs and angular olivine grains in a dark brown, fine-grained matrix.

Geochemistry: Olivine (Fa0.7-70.4; Cr2O3 in ferroan olivine = 0.16-0.53 wt.%, mean 0.25 wt.%, s.d. 0.12, N = 17), orthopyroxene (Fs1.1-16.5Wo0.9-4.6), clinopyroxene (Fs1.3-2.7Wo47.7-51.3).

Classification: Carbonaceous chondrite (CO3.1). Estimation of subtype based on the scheme of Grossman and Brearley (2005).

Specimens: A total of 20.2 g of material and one polished thin section are on deposit at UWB. GHupé holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2013 Feb
Mass (g):146
Pieces:2
Class:CO3.1
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):0.7-70.4
Ferrosilite (mol%):1.1-16.5
Wollastonite (mol%):0.9-4.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.5
Type spec location:UWB
Main mass:GHupé
Comments:GH-448; submitted by A. Irving
Institutions
   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)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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