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Northeast Africa 027 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northeast Africa 027 This is an OFFICIAL meteorite name. Abbreviation: NEA 027 Observed fall: No Year found: 2019 Country: Libya Mass: 497 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||
Comments: | Approved 17 Oct 2021 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 110:
Northeast Africa 027 (NEA 027) Libya Purchased: 2019 Dec Classification: Ureilite History: Purchased by Mbark Arjdal in December 2019 from a Libyan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Composed of very finely recrystallized (mosaicized) olivine and clinopyroxene (accompanied by rare larger grains) together with accessory graphite, suessite, Si-bearing kamacite, Fe metal (with trace P), troilite, Cr-bearing troilite and pentlandite. Alteration of primary metal to iron hydroxides is pervasive. Geochemistry: Olivine has reduced magnesian rims (despite the mosaicism). Olivine cores (Fa12.3-20.2, N = 4, olivine rims (Fa4.1-10.5, N = 5). Olivine contains 0.46 - 0.90 wt.% Cr2O3 and 0.20 - 0.34 wt.% CaO. Pigeonite (Fs8.1-13.5Wo8.3-6.5, N = 2), subcalcic augite (Fs4.4-9.9Wo30.3-31.8, N = 2), kamacite (Ni 3.4%, Si 3.8%). Classification: Ureilite (shock recrystallized). Interesting features include the very high degree of mosaic recrystallization of mafic silicates plus the presence of accessory suessite and Si-bearing kamacite. Specimens: 31.7 g plus one polished thin section at UWB; remainder with Mr. M. Arjdal. | ||||||||||||||||||||||||||||||
Data from: MB110 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography: |
Statistics: This is 1 of 1550 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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