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| Northwest Africa 470 | |||||||||||||||||
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| Basic information | Name: Northwest Africa 470 This is an OFFICIAL meteorite name. Abbreviation: NWA 470 Observed fall: No Year found: 1999 Country: Morocco Mass:  62.9 g | ||||||||||||||||
| Classification history: |
This is 1 of 28 approved meteorites classified as CH3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CH chondrites, CH-CB family, and Metal-rich meteorites | ||||||||||||||||
| Writeup |
Writeup from MB 85:
Northwest Africa 470 Morocco Found 1999 Carbonaceous chondrite (CH) A meteorite weighing 62.9 g was purchased from nomads by S. Afanasiev during an expedition to the Er Rachidia region of the Moroccan Sahara in 2000 April. Mineralogy and classification (M. Ivanova and M. Nazarov, Vernad; M. Petaev, CfA): fusion crust is blackish-brown; there are two populations of chondrules, one with cryptocrystalline textures, 20–50 µm in size, the other with porphyritic olivine-pyroxene or barred olivine textures, >50 µm in size; matrix is absent; contains ~20 vol% metal with a solar Ni/Co ratio; olivine, Fa2.0; pyroxene, Fs2.8; contains CAIs of different types, many grossite-rich. Oxygen isotopes (R. Clayton and T. Mayeda, UChi): δ17O = –0.40·, δ18O = +2.20·, indicating CH-CR clan. Specimens: type specimen, 7.2 g, and thin section, Vernad; main mass with purchaser, S. Afanasiev. | ||||||||||||||||
| Data from: MB85 Table 4 Line 124: |
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| Plots: | O isotopes: | ||||||||||||||||
| Institutions and collections |
UChi: University of Chicago, Chicago, IL 60637, United States (institutional address; updated 28 Feb 2011) Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016) CfA: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States (institutional address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
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Geography:
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Statistics: This is 1 of 62 approved meteorites from Meknès-Tafilalet, Morocco This is 1 of 2003 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||
| Proximity search: | |||||||||||||||||
| Synonyms: |
Er Rachidia 001 (From MetBase) | ||||||||||||||||