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Northwest Africa 11732 | |||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11732 This is an OFFICIAL meteorite name. Abbreviation: NWA 11732 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 2 approved meteorites classified as CM2.0. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites | ||||||||||||||||||||||||
Comments: | Approved 19 Apr 2018 | ||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Northwest Africa 11732 (NWA 11732) (Northwest Africa) Purchased: 2017 Classification: Carbonaceous chondrite (CM2.0) History: The meteorite was purchased from a local meteorite dealer in Morocco. Physical characteristics: Small black individual with some fusion crust. Petrography: The meteorite is a brecciated carbonaceous chondrite composed of chondrule, mineral and CAI polymorphs set into a fine-grained matrix of phyllosilicates (as indicated by fibrous appearance), carbonates and sulfides including up to 400 μm long needles of Ni-bearing pyrrhotite. Carbonates are almost pure calcites and Mg-Mn-Fe-rich varieties. The hydrous and porous nature of the matrix is also proven by low analytical totals of defocused (10 μm beam diameter) electron microprobe analyses. Many components are surrounded by flaky phyllosilicates apparently replacing former dust rims. No anhydrous silicates have been found. Geochemistry: Mean values of defocused (10 μm beam diameter) matrix analyses (all wt%; N=27): SiO2: 27.0, TiO2: 0.09; Na2O: 0.11; Cr2O3: 0.41, MgO: 19.8, MnO: 0.18, CaO: 0.25, FeO: 21.7, Al2O3: 2.29, NiO: 0.79, P2O5: 0.03, S: 0.36, Total: 73.01 Classification: CM2.0. Subtype based on the absence of anhydrous silicates. | ||||||||||||||||||||||||
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 7547 approved meteorites from (Northwest Africa) (plus 1970 unapproved names) |