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Northwest Africa 13476 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13476 This is an OFFICIAL meteorite name. Abbreviation: NWA 13476 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 251 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||
Comments: | Approved 12 Dec 2020 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13476 (NWA 13476) (Northwest Africa) Purchased: 2020 Aug Classification: Ureilite History: Purchased by John Divelbiss in August 2020 from Matthew Stream, who acquired it from a Moroccan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular aggregate of olivine (~70 vol.%) and low-Ca pyroxene (~30 vol.%). Olivine exhibits reduced, more magnesian rims associated with very fine grained Fe metal (some containing small granules of schreibersite). Accessory phases identified include graphite, troilite and Cr-troilite. The presence of microdiamond is also inferred from the extreme difficulty in cutting this specimen (the owner reported that several diamond saw blades were severely damaged in attempts to remove the type material). Geochemistry: Olivine (cores Fa18.5±0.1, N = 4; rims Fa3.1-5.7, N = 4), low-Ca pyroxene (Fs16.1±0.1Wo4.8±0.1, N = 5; Fs9.2Wo6.2). Classification: Ureilite. Specimens: 22.4 g including one polished thin section at UWB; remainder with Mr. J. Divelbiss. | ||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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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) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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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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