Green Quartz
Higashi-Akatani, Shibata city, Niigata pref., Japan
Source for silicon
Width: 20 mm. Green quartz associated with hematite. The dark green parts are green quartz. The platy black crystals with a metallic luster are hematite. The massive reddish-brown parts are aggregate of fine hematite crystals. The white part is clay filling an open space.
Recovered from a moderate-temperature hydrothermal deposit and the oxidative metazomatic zone combined with skarn formed by contact metamorphism of the S-type (Ilmenite-series) granodiorite. Formed in the early Miocene (21 Ma).
Quartz from this location was described in 1952.
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)