Laumontite
Heguri-naka, Minami-Boso city, Chiba pref., Japan
Field of view: 10 mm. Laumontite associated with thomsonite-Ca. The bladed opaque white crystal at the center is laumontite. The translucent parts are thomsonite-Ca. The grayish-brown host at the bottom is tuff.
Recovered from an open space of a thomsonite-Ca vein in tuff of an accretionary complex subjected to Prehnite-Pumpellyite facies metamorphism.
Laumontite from this location was described in 1982.
Other localities
- Myoho Mine (Sediment-hosted Cu, Prismatic)
- Nakayashiki (PrP facies, Radial)
- Chiyabayama (PrP facies, Prismatic)
- Heguri (PrP facies, Prismatic)
- Obora Path (Hyaloclastite, Prismatic)
- Takarayama Mine (GS facies, Vein)
- Nishizawa Mine (Hydrothermal Au-Ag, Prismatic)