Prehnite

Heguri-naka, Minami-Boso city, Chiba pref., Japan

Field of view: 10 mm. Prehnite associated with gabbro. The transparent pale green parts exhibiting a vitreous luster are groups of tabular prehnite crystals. The surrounding opaque white parts are aggregate of fine prehnite crystals. The grayish-green part at the lower left is plagioclase of the host gabbro.

Recovered from a prehnite vein in gabbro of an accretionary complex subjected to Prehnite-Pumpellyite facies metamorphism.

Prehnite from this location was described in 1965.

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)