Home > American Minerals II – April 7 > MS1565 Donpeacorite with Kanoite
Donpeacorite with Kanoite - Sold
- Zinc Corporation of America #4 mine
- Balmat
- St. Lawrence County
- New York
- U.S.A.
- 2.8 by 2.0 by 0.9 cm – Thumbnail specimen (fits into a 2.5 cm cube)
Donpeacorite and kanoite are polymorphous magnesium manganese silicates, and both members of the pyroxene group (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 having 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!
