Laumontite
Kawamata, Nikko city, Tochigi pref., Japan
Field of view: 10 mm. Laumontite associated with quartz, a gangue mineral of the low temperature hydrothermal Au-Ag deposit. The opaque white fine prisms in the void are laumontite. The fine pale brown granules are too small to distinguish.
Recovered from a quartz vein of a hydrothermal Au-Ag deposit associated with rhyolitic tuff breccia, eruption products of a caldera. Formed in the late Miocene (7.2 Ma).
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)