TrekGEO > Mineral Trail > Koshinetsu region > Yamanashi pref. > Calcite

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Sugiyama, Minobu city, Minami-Koma county, Yamanashi pref., Japan

Source for Quick lime and Sodium cyanide


Field of view: 30 mm. Calcite associated with prehnite. The scalenohedral transparent crystals are calcite perched on prehnite. The translucent white basement is prehnite. This calcite is fluorescnet.

Recovered from an open space of a prehnite vein in basaltic-andesitic hyaloclastite subjected to Prehnite-Pumpellyite facies metamorphism. Formed in the middle Miocene (12 Ma).

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