TrekGEO > Mineral Trail > Kanto region > Tochigi pref. > Mangano-cummingtonite

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Kyurazawa Mine

Ashio village, Nikko city, Tochigi pref., Japan


Field of view: 5mm. Prismatic mangano-cummingtonite. The white prisms exhibiting perfect cleavage are mangano-cummingtonite or Mn-bearing tremolite. The black part at the lower left is manganese dioxide formed by weathering.

Recovered from a chert-hosted bedded manganese deposit subjected to Albite-Epidote-hornfels contact metamorphism. Formed in the early Paleocene (64 Ma).

Manganocummingtonite from this location was described in 1961 as manganese amphibole.

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