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

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


Field of view: 10 mm. Prehnite crystals. The tabular transparent crystals with a vitreous luster are prehnite.

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

Prehnite from this location was described in 1982.

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