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Northwest Africa 7229 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7229 This is an OFFICIAL meteorite name. Abbreviation: NWA 7229 Observed fall: No Year found: 2011 Country: (Northwest Africa) Mass: 125 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 11 Dec 2013 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7229 (NWA 7229) (Northwest Africa) Purchased: 2011 Classification: HED achondrite (Eucrite, polymict) Petrography: The meteorite is almost completely covered by fusion crust and displays a fresh greyish interior. Different lithic clast are easily discernible and include basaltic lithologies with different grain sizes and dark melt clasts. Mineral fragments are calcic plagioclase and different pyroxenes, i.e. exsolved Ca-rich pyroxenes and often chemically zones Ca-poor pyroxenes. Minor phases are SiO2, chromite, and pyrrhotite. Geochemistry: opx: Fs4-62.5Wo0.8-5, FeO/MnO=27-36; cpx: Fs17.7-33.2Wo42.1-44.9, FeO/MnO=28-33; calcic plagioclase: An93 (range 89.1-94.8. Orthopyroxenes display compositional zoning with cores as low as Fs4. | ||||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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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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