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Northwest Africa 6983 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 6983 This is an OFFICIAL meteorite name. Abbreviation: NWA 6983 Observed fall: No Year found: 2011 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 218 approved meteorites classified as Eucrite-br. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 24 Sep 2016 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 105:
Northwest Africa 6983 (NWA 6983) (Northwest Africa) Purchased: 2011 Classification: HED achondrite (Eucrite, brecciated) History: The meteorite was bought in 2011 from a local meteorite dealer in Morocco. Physical characteristics: The two grayish individuals are partly covered by fusion crust. Petrography: The meteorite is a lithic breccia composed of basaltic, gabbroic, melt and mineral clasts up to 5 mm in size embedded in a fine-grained clastic matrix. Basaltic clasts show coarse- and fine-grained textures and melt clasts are almost opaque. Dominant minerals in clasts and groundmass are calcic plagioclase and exsolved pyroxene. Minor phases include pyrrhotite, troilite, silica, zircon and chromite. Geochemistry: low-Ca pyroxene: Fs43.5±0.6Wo2.5±0.9 (Fs42.5-44.3Wo1.3-4.1, n=17, FeO/MnO=27-32); Ca-pyroxene: Fs23.6±7.0Wo34.6±10.9 (Fs15.3-32.0Wo21.2-50.6, n=13, FeO/MnO=24-28); calcic plagioclase: An87.3±4.4 (An79.9-92.6, n=14) | ||||||||||||||||||||||||||||
Data from: MB105 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos: |
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |