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Northwest Africa 7639 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7639 This is an OFFICIAL meteorite name. Abbreviation: NWA 7639 Observed fall: No Year found: 2008 Country: (Northwest Africa) Mass: 294 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 522 approved meteorites classified as Diogenite. [show all] Search for other: Achondrites, Diogenites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 8 Nov 2014 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 103:
Northwest Africa 7639 (NWA 7639) (Northwest Africa) Purchased: 2008 Classification: HED achondrite (Diogenite) History: Purchased by Philip Mani from a Moroccan dealer in 2008. Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed mainly of large angular grains of orthopyroxene and olivine within a finer grained fragmental matrix containing the same minerals plus chromite, anorthite, clinopyroxene and troilite. Some polymineralic clasts contain olivine and plagioclase in contact with orthopyroxene, and in one there is a symplectitic intergrowth of chromite in orthopyroxene. The overall proportions of minerals are estimated to be ~80 vol.% orthopyroxene with ~15 vol.% olivine and ~5 vol.% plagioclase and others. Geochemistry: Orthopyroxene (Fs23.3-24.6Wo1.8; FeO/MnO = 26-27), olivine (Fa28.7-28.8; FeO/MnO = 45-48), clinopyroxene (Fs7.5-8.0Wo46.5-45.8; FeO/MnO = 16-17). Classification: Diogenite (monomict breccia). The relative proportions of olivine and plagioclase indicate that this specimen can be termed an olivine orthopyroxenitic diogenite. Specimens: 41.1 g of material and one polished thin section are on deposit at UWB. PMani holds the main mass. | ||||||||||||||||||||||||||||||
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) PMani: Philip Mani, 20726 Stone Oak Parkway, Suite 116, San Antonio, TX 78258 , United States (private address; updated 2 Jan 2010) |
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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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Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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