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Northwest Africa 7502
Basic information Name: Northwest Africa 7502
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7502
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 882 g
Meteoritical Bulletin:  MB 102  (2013)  CR2
Recommended:  CR2    [explanation]

This is 1 of 183 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 6 Sep 2013
Writeup from MB 102:

Northwest Africa 7502 (NWA 7502)

(Northwest Africa)

Purchased: 2012 Oct

Classification: Carbonaceous chondrite (CR2)

History: Purchased by GHupé in October 2012 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed round chondrules (mostly very magnesian; some with opaque rims composed of altered kamacite or very fine grained dust aggregates) and rare, small CAI in a deep reddish-brown matrix. The matrix mineralogy is difficult to characterize, but a mineral compositionally resembling cronstedtite was identified as one component. Other minerals are olivine, orthopyroxene, pigeonite, subcalcic augite, spherical kamacite grains and fine grained troilite.

Geochemistry: Olivine (Fa0.5-33.6), orthopyroxene (Fs0.7-2.4Wo1.0-0.6), pigeonite (Fs2.9Wo24.2), subcalcic augite (Fs1.1-3.1Wo34.1-29.7). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O = -0.980, -1.331; δ18O = 2.058, 1.622; Δ17O = -2.067, -2.187 per mil (for a TFL slope of 0.528).

Classification: Carbonaceous chondrite (CR2).

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2012 Oct
Mass (g):882
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):0.5-33.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.3
Type spec location:UWB
Main mass:GHupé
Comments:GH-443; submitted by A. Irving
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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