Prehnite

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.

Other localities

List of Japanese prehnite localities

Heguri (Metagabbro, Amygdaloidal)
Shiraki (Rodingite, Radial)
Horado Mine (Skarn, Tabular)
Iwakake (PrP facies, Amygdaloidal)
Nakayashiki (PrP facies, Tabular)