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Northwest Africa 7968 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7968 This is an OFFICIAL meteorite name. Abbreviation: NWA 7968 Observed fall: No Year found: 2011 Country: (Northwest Africa) Mass: 48 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 451 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||
Comments: | Approved 31 Dec 2015 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 7968 (NWA 7968) (Northwest Africa) Purchased: 2011 Sep Classification: HED achondrite (Howardite) History: Purchased by Dr. David Gregory in September 2011 from a dealer at the Denver Show. Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia consisting mostly of shocked diogenitic clasts plus ~30 vol.% eucritic clasts (with fine intersertal to gabbroic textures) and some angular grains of olivine (with variable composition). Diogenite clasts consist predominantly of orthopyroxene (exhibiting marked undulose extinction and strong cataclasis) with accessory chromite. Eucritic clasts consist of exsolved pigeonite and calcic plagioclase (mostly converted to maskelynite, but some polycrystalline) with accessory silica polymorph, ilmenite, Ti-chromite and troilite. Geochemistry: Diogenitic orthopyroxene (Fs26.2-26.7Wo2.8-2.9, FeO/MnO = 30, N = 2), eucritic orthopyroxene host (Fs49.8Wo4.3, FeO/MnO = 32), clinopyroxene exsolution lamella(Fs20.6Wo44.0, FeO/MnO = 24), orthopyroxene (Fs42.7Wo4.1; Fs50.4Wo1.8, FeO/MnO = 30-31), augite (Fs28.6Wo39.7, FeO/MnO = 28), olivine (Fa36.6-48.1, FeO/MnO = 50-52, N = 3), plagioclase (An84.7Or0.6; An78.4Or1.3, N = 2). Classification: Howardite (shocked). Specimens: 11.55 g including one polished thin section and one polished mount at ROM; remainder with DGregory. | ||||||||||||||||||||||||||||||
Data from: MB104 Table 0 Line 0: |
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Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) |
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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 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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