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Northwest Africa 11704 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11704 This is an OFFICIAL meteorite name. Abbreviation: NWA 11704 Observed fall: No Year found: 2018 Country: Mauritania Mass: 1127 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 407 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 27 Mar 2018 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11704 (NWA 11704) Mauritania Purchased: 2018 Jan Classification: HED achondrite (Eucrite, polymict) History: A batch of about 50 stones with similar appearance found together in Mauritania was purchased by John Higgins in January 2018 from a Mauritanian dealer. Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting predominantly of gabbroic eucrite clasts, some ophitic eucrite clasts and sparse clasts of feldspathic diogenite in a finer grained matrix. Minerals include exsolved pigeonite, calcic plagioclase (exhibiting undulose to polycrystalline microstructure), silica polymorph, ilmenite, Ti-chromite, Ti-poor chromite, troilite and minor barite. Feldspathic diogenite clasts consist mainly of relatively ferroan orthopyroxene with subordinate anorthite and minor clinopyroxene. Geochemistry: Orthopyroxene host (Fs58.5Wo4.6, FeO/MnO = 35), clinopyroxene exsolution lamella (Fs28.1Wo41.0, FeO/MnO = 34), orthopyroxene host (Fs44.5Wo2.2, FeO/MnO = 30), clinopyroxene exsolution lamella (Fs17.8Wo43.8, FeO/MnO = 25), plagioclase (An86.6Or0.8). Minerals in feldspathic diogenite clast: orthopyroxene (Fs33.2-33.8Wo1.7-2.4, FeO/MnO = 29-32, N = 2), clinopyroxene (Fs10.8Wo45.8, FeO/MnO = 21), anorthite (An95.4Or0.2). Classification: Eucrite (polymict breccia). Specimens: 26.6 g including one polished thin section at UWB; remainder with Mr. J. Higgins. | ||||||||||||||||||||||||||||
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) |
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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 220 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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