Ichino River
Ranzan city, Hiki county, Saitama pref., Japan
Synonym
Ichinokawa River
Occurrence
Hydrothermal deposit along fault
Chalcedony vein in rhyolitic tuff of Hatakeyama Tuff Member, Arakawa Formation. This chalcedony was possibly formed by low temperature hydrothermal activity associated with the fault between Arakawa Formation and Ryoke Metamorphic Rocks.
Outcrop of tuff of Hatakeyama Tuff Member, Arakawa Formation. The white vein at the left of the coin is chalcedony. The grayish-white host is tuff.
Reported Minerals
- Chalcedony
- Red Jasper
Mineral Assemblages
- Chalcedony
History
- 1960s: Local people found this locality. Red jasper was mined for ornamental stone.
Localities
- Ichino River (Fault, Chalcedony)
- Tatarazawa (Median Tectonic Line, Dawsonite)
- Niu (Median Tectonic Line, Dawsonite)
- Hitodo (Kannawa Fault, Glauconite)