Laumontite
Toi, Izu city, Shizuoka pref., Japan
Field of view: 20 mm. Laumontite crystals. The truncated opaque white prisms are laumontite. It turned opaque by dehydration. The grayish-brown host is hyaloclastite.
Recovered from an open space of a zeolite vein in tholeiitic andesitic-basaltic tuff breccia in an oceanic arc subjected to prophylitization alteration.
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)