Home > Rock Forming Minerals – June 20 > MS1351 Donpeacorite with Kanoite

Donpeacorite with Kanoite


Donpeacorite and kanoite are polymorphous magnesium manganese silicates, both pyroxene group minerals (Morimoto et al. 1988). Donpeacorite has orthorhombic symmetry while kanoite has monoclinic symmetry. Peterson et al. (1984) named donpeacorite after Donald R. Peacor (1937- ), mineralogist at the University of Michigan. Kobayashi (1977) named kanoite after Dr. Hiroshi Kano, Akita University, Japan.

This specimen is unusual in showing two coexisting polymorphous minerals. Donpeacorite forms the splintery light orange blades, and kanoite forms a brownish orange solid mass. The donpeacorite shows good cleavage, whereas the kanoite does not. A rich example! Rare!

Price: $300

Item code: MS1351

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