TrekGEO > Mineral Trail > Kanto region > Chiba pref. > Thomsonite-Ca

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


Field of view: 10 mm. A group of thomsonite-Ca. The group of platy white crystals is thomsonite-Ca. The massive light brown part at the upper right is the host tuff.

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

Thomsonite-Ca from this location was described in 1982.

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