Okorogawa Mine
Naka-Okorogara, Nikko city, Tochigi pref., Japan
Occurrence
Moderately high-T hydrothermal deposit
Oxidation zone of the moderate temperature hydrothermal deposit. The deposit was produced in sedimentary rocks of Kurohone-Kiryu Complex, a member of Jurassic accretionary complex of Tamba-Mino-Ashio Belt.
Outcrop of the oxidation zone of the Cu-dominant moderately high-temperature hydrothermal deposit. The green part is thin crust of chrysocolla. The white host is sandstone of Kurohone-Kiryu Complex. Various secondary minerals were formed by oxidation of Cu-bearing minerals in the deposit.
Reported Minerals
- Chalcopyrite
- Pyrite
- Arsenopyrite
- Pyrrhotite
- Azurite
- Malachite
- Gypsum
- Posnjakite
- Langite
- Philipsbornite("Hidalgoite")
- Cuprite
- Copper
- Cu-allophane
- Aurichalcite
- Chrysocolla
Mineral Assemblages
- Limonite - Azurite
Localities
- Hikida Mine (Cu-Pb-Zn, Siderite)
- Okorogawa Mine (Cu)
- Shizuki Mine (Cu, Marine oxidation)