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| Northwest Africa 8261 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 8261 This is an OFFICIAL meteorite name. Abbreviation: NWA 8261 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass:  559 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 425 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
| Comments: | Approved 18 May 2014 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 103:
Northwest Africa 8261 (NWA 8261) (Northwest Africa) Purchased: 2014 Jan Classification: HED achondrite (Eucrite, polymict) History: Purchased by Kuntz in January 2014 from a dealer in Erfoud, Morocco. Petrography: (A. Irving and S. Kuehner, UWS) Polymict breccia composed predominantly of crystalline debris related to sparse lithic clasts of gabbroic eucrite, along with rare clasts of much finer grained, intersertal-textured eucrite, autolithic breccia clasts (i.e., breccia within breccia), and rare fragments of diogenitic orthopyroxene. Gabbroic eucrite clasts consist of exsolved pigeonite and polycrystalline calcic plagioclase with accessory silica polymorph, ilmenite, chromite, troilite and barite. Isolated grains of olivine, more ferroan augite, and ferroan pigeonite are also present. Geochemistry: Diogenitic orthopyroxene (Fs23.9Wo2.3, FeO/MnO = 27), host orthopyroxene (Fs60.2Wo3.2, FeO/MnO = 32), clinopyroxene exsolution lamellae (Fs28.9Wo41.4, FeO/MnO = 29), olivine (Fa54.0, FeO/MnO = 45), ferroan augite (Fs35.0Wo40.0, FeO/MnO = 29), ferroan pigeonite (Fs62.0Wo24.2, FeO/MnO = 30). Classification: Eucrite, polymict breccia. Specimens: 20.9 g including a polished thin section at UWB. The remainder is held by Kuntz. | ||||||||||||||||||||||||||||||
| Data from: MB103 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) Kuntz: Fabien Kuntz, France; Website (private address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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| Photos: |
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| Geography: |
Statistics: This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names) | ||||||||||||||||||||||||||||||