TrekGEO > Mineral Trail > Kanto region > Chiba pref. > Prehnite

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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.

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