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Northwest Africa 12967 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12967 This is an OFFICIAL meteorite name. Abbreviation: NWA 12967 Observed fall: No Year found: 2019 Country: Mauritania Mass: 4.6 kg | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 273 approved meteorites classified as Mesosiderite. [show all] Search for other: Mesosiderites, Metal-rich meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 23 Dec 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12967 (NWA 12967) Mauritania Purchased: 2019 May Classification: Mesosiderite History: Found in Mauritania and purchased by Rachid Chaoui in May 2019 from a dealer in Nouakchott, Mauritania. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Aggregate of predominantly orthopyroxene, anorthite and metal (~30 vol.%, kamacite with minor taenite) plus subordinate olivine (as fractured unzoned grains with a range of compositions), augite, silica polymorph (as acicular grains), chromite, troilite, pentlandite, ilmenite and merrillite. Orthopyroxene is compositionally-zoned (with symplectitic chromite in the ferroan rims) and some orthopyroxene contains irregular included blebs of augite. Geochemistry: Zoned orthopyroxene (cores: Fs17.8-22.6Wo1.0-2.1, FeO/MnO = 30-33, N = 4; rims: Fs30.1-34.1Wo3.8-1.9, FeO/MnO = 22-24, N = 4), olivine (Fa17.6-26.7, FeO/MnO = 36-41, N = 5), ferroan orthopyroxene hosts (Fs36.0-38.4Wo2.3-3.0, FeO/MnO = 21-23, N = 2), clinopyroxene blebs in orthopyroxene (Fs16.3-16.8Wo42.9-41.9, FeO/MnO = 17-18, N = 2), anorthite (An90.2-90.3Or0.3, N = 2). Classification: Mesosiderite. Specimens: 49 g polished slice at UWB; remainder with Mr. R. Chaoui. | ||||||||||||||||||||||||||||||
Data from: MB108 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 221 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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