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Northwest Africa 8428 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8428 This is an OFFICIAL meteorite name. Abbreviation: NWA 8428 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: 1470 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 1 May 2015 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 8428 (NWA 8428) (Northwest Africa) Purchased: 2014 Mar Classification: HED achondrite (Eucrite, polymict) History: Purchased in Temara, Morocco by Adam Aaronson in March 2014 and subsequently sold to Fredric Stephan. Petrography: (A. Irving and S. Kuehner, UWS) Complex fragmental breccia composed of basaltic eucrite clasts, microgabbroic eucrite clasts, ~5 vol.% diogenitic orthopyroxene grains (of several different compositions) and sparse dark, metal-bearing, fragmental genomict breccia clasts within a matrix of finer related mineral debris. Minerals are calcic plagioclase, orthopyroxene, exsolved pigeonite, fayalite, ferropigeonite, ilmenite, troilite and kamacite (as irregularly shaped grains). Geochemistry: Diogenitic orthopyroxene (Fs20.9Wo2.3; Fs25.0Wo1.9; Fs33.4Wo2.5; FeO/MnO = 30-32 N = 3), fayalite (Fa87.4-87.5; FeO/MnO = 40-45, N = 2), ferropigeonite (Fs58.7Wo22.5; FeO/MnO = 31). Pigeonite grains consist of exsolution lamellae of clinopyroxene (Fs24.8-25.2Wo43.0-43.7; FeO/MnO = 29-32; N = 2) within host orthopyroxene (Fs61.1-61.0Wo1.5-1.6; FeO/MnO = 33; N = 2). Classification: Eucrite (polymict breccia). Specimens: 21.4 g including one polished thin section at UWB. The remainder is held by Mr. F. Stephan. | ||||||||||||||||||||||||||||||
Data from: MB104 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) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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