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Northwest Africa 7502 | |||||||||||||||||||||||||||
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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: 882 g | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 185 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 |
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: MB102 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||
Institutions 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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