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| Northwest Africa 11640 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 11640 This is an OFFICIAL meteorite name. Abbreviation: NWA 11640 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass:  500 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 623 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||
| Comments: | Approved 20 Feb 2018 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Northwest Africa 11640 (NWA 11640) (Northwest Africa) Purchased: 2017 Classification: Ureilite History: The meteorite was purchased from a local meteorite dealer in Morocco. Physical characteristics: Dark brownish fragment lacking any fusion crust. Petrography: The meteorite shows a cumulate texture of up to 2.5 mm sized olivine and pigeonite grains. Olivine crystals appear to consists of smaller subgrains and pigeonite shows patchy compositional zoning. Olivine displays characterisitic reduced rims. The meteorite contains diamond and shows some foliation. Geochemistry: reduced rims in olivine: Fa2.0-7.7; olivine contains 0.65±0.04 wt% Cr2O3 and 0.35±0.02 wt% CaO | ||||||||||||||||||||||||||||||
| Data from: MB107 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. 107, MAPS 55, 460-462
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| Photos: |
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| Geography: |
Statistics: This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||