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Northwest Africa 13643 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13643 This is an OFFICIAL meteorite name. Abbreviation: NWA 13643 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 544 approved meteorites classified as CM2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 16 Jan 2021 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13643 (NWA 13643) (Northwest Africa) Purchased: 2020 Classification: Carbonaceous chondrite (CM2) History: The meteorite was purchased from a dealer in Morocco. Physical characteristics: Many small dark grayish to black individuals without fusion crust. Petrography: Brecciated carbonaceous chondrite composed of small (apparent mean diameter about 250 μm) chondrules, chondrule pseudomorphs, mineral fragments, and rare CAIs many of which surrounded by fine-grained dust rims set into abundant fine-grained matrix. Matrix is Fe-rich with abundant Fe-sulfides and rare Ca-carbonates. Low analytical totals of matrix analyses suggest the presence of hydrous phyllosilicates. Geochemistry: Matrix analyses yield an average total of 78.4±1.4 wt% (5 µm defocused beam, N=10) suggesting the presence of hydrous minerals. | ||||||||||||||||||||||||||||||
Data from: MB110 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. 110, in preparation (2021)
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Geography: |
Statistics: This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names) |