| abstract: |
CM carbonaceous chondrites exhibit a variety of mineralogy depending on the degrees of aqueous alteration and thermal metamorphism [e.g., Zolensky et al., 1993]. However, mamy phyllosilicate-rich CMs have mineralogical signatures in common: matrix hydrous phases are serpentine, cronstedtite, and tochilinite, dominant carbonates are calcite and dolomite, and magnetite is not abundant. As a course of analysis of more than 40 CM samples, we found MET00432 CM chondrite with a unique mineralogy that set it apart from typical phyllosilicate-rich CM chondrites.
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