Quartz
Mount Ogawa
Kawahage, Kawakami city, Saku county, Nagano pref., Japan
This locality is closed to collecting.
Source for silicon
Length: 30 mm. Prismatic crystals of quartz. Quartz crystals are observed in the open spaces of quartz veins cutting granite.
Observed in the open space of quartz veins associated with S-type (Ilmenite-series) biotite monzogranite. Formed in Miocene or Pliocene.
Quartz from this location was described in 2006.
Other localities
- Kobushi Mine (Skarn, Japanese twin)
- Sanjyo Mine (Skarn, Japanese twin)
- Akatani Mine (Skarn, Green)
- Hirukawa (Pegmatite, Black)
- Otome Mine (Alpine Fissure)
- Takemori (Alpine Fissure, Phantom/Double pointed/Inclusions)
- Mount Ogawa (Alpine Fissure)
- Takaneyama Mine (Hydrothermal, Radial)
- Arakawa Mine (Hydrothermal)