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Mangano-cummingtonite

Oashi Mine

Kusagyu, Kanuma city, Tochigi pref., Japan

Mangano-cummingtonite

Field of view: 5mm. Mangano-cummingtonite associated with rhodonite. The white acicular crystals with perfect cleavage are mangano-cummingtonite or Mn-bearing tremolite. The surrounding massive pink host is aggregate of rhodonite and quartz. The black parts are dirt of manganese dioxide by weathering.

Recovered from a chert-hosted bedded manganese deposit subjected to Hornblende-hornfels facies contact metamorphism. Formed in the Late Cretaceous (83 Ma).

Manganocummingtonite from this location was described in 2008 as Mn-bearing tremolite.

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