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Northwest Africa 11840 | |||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11840 This is an OFFICIAL meteorite name. Abbreviation: NWA 11840 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 1.8 g | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 635 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 4 Jul 2018 | ||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11840 (NWA 11840) (Northwest Africa) Purchased: 2018 Classification: Carbonaceous chondrite (CM2) History: The meteorite was purchased from a local meteorite dealer in Morocco. Physical characteristics: Many small almost black fragments partially covered with fusion crust. Petrography: Brecciated carbonaceous chondrite with abundant Fe-rich matrix, chondrules (mean diameter 280 μm), chondrule pseudomorphs, CAIs, and mineral fragments. Many components are surrounded by fine-grained dust rims. Matrix consists of abundant carbonates, sulfides and phyllosilicates. No pyroxene has been detected in the thin section studied. Absence of pyroxene and presence of Fe-Mg-rich carbonates attest to a high degree of alteration. Geochemistry: Carbonates contain up to 1.3 wt% MgO and 1.0 wt% FeO | ||||||||||||||||||||||||||
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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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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