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Northwest Africa 12243 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12243 This is an OFFICIAL meteorite name. Abbreviation: NWA 12243 Observed fall: No Year found: 2018 Country: Mauritania Mass: 164 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 24 Nov 2018 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12243 (NWA 12243) Mauritania Purchased: 2018 May Classification: HED achondrite (Eucrite, polymict) History: Found in Mauritania and purchased by Darryl Pitt in May 2018 from a Mauritanian dealer. Petrography: (A. Irving and S. Kuehner, UWS) Fresh breccia specimen consisting of larger angular mineral clasts derived mostly from gabbroic eucrites in a finer matrix of the same phases. Minerals are exsolved pigeonite, anorthite, silica polymorph, unexsolved ferroan pigeonite, minor (<10 vol.%) diogenitic orthopyroxene, olivine, ilmenite, chromite and troilite. Geochemistry: Diogenitic orthopyroxene (Fs27.9-29.0Wo2.1-3.6, FeO/MnO = 27-28, N = 2), olivine (Fa42.3-51.0, FeO/MnO = 50, N = 2), low-Ca pyroxene host in exsolved pigeonite (Fs43.5-45.9Wo2.6-5.5, FeO/MnO = 27-34, N = 2), clinopyroxene exsolution lamella (Fs17.7Wo44.2, FeO/MnO = 26), subcalcic augite (Fs62.5Wo26.0 FeO/MnO = 34), anorthite (An91.5-93.9Or0.6-0.5, N = 2). Classification: Eucrite (polymict breccia). Specimens: 20.1 g including one polished thin section at UWB; remainder with DPitt. | ||||||||||||||||||||||||||||||
Data from: MB107 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) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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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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