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Northwest Africa 6921 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 6921 This is an OFFICIAL meteorite name. Abbreviation: NWA 6921 Observed fall: No Year found: 2011 Country: (Northwest Africa) Mass: 1749 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 3 approved meteorites classified as CR6. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), and CR chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 27 Sep 2013 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 6921 (NWA 6921) Northwest Africa Purchased: 2011 Aug Classification: CR6 History: Purchased by Adam Aaronson in Temara, Morocco in 2011 August. Physical characteristics: A single fresh, pale greenish stone (1749 g) with patchy black fusion crust. Petrography: (A. Irving and S. Kuehner, UWS) Predominantly poikiloblastic texture, but with rare small BO chondrules. There are some larger olivine grains, but most of the specimen is an aggregate of finer olivine, orthopyroxene, minor clinopyroxene, intermediate plagioclase, fresh kamacite, chromite, troilite, and merrillite. Geochemistry: Olivine (Fa37.5-37.9, FeO/MnO = 91), orthopyroxene (Fs29.5-29.7Wo2.9-3.3, FeO/MnO = 54-57), clinopyroxene (Fs11.5-12.7Wo44.5-43.8, FeO/MnO = 31-34). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ17O = -0.280, -0.065; δ18O = 2.788, 3.181; and Δ17O = -1.747, -1.738 per mil. Classification: Carbonaceous chondrite (CR6). This specimen is a highly equilibrated CR chondrite paired with NWA 2994, NWA 3250, NWA 6901 and NWA 7317. Specimens: A total of 20.3 g of sample and one polished thin section are on deposit at UWB. Aaronson holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional 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) | ||||||||||||||||||||||||||||||
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Revision history: |
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