Hosoyama
Shiroishi, Higashi-Chichibu city, Chichibu county, Saitama pref., Japan
Occurrence
Serpentinite in Mikabu Unit of Sanbagawa Belt. This serpentinite block contais calcite veins, and mined as ophicalcite for construction material.
Outcrop of serpentinite in Mikabu Unit. The green host is serpentinite. The front face of the outcrop is along the vein of fibrous white chrysotile. Chrysotile is fine white fibers which come loose easily by hands. Antigorite is rough green fibers which does not come loose.
Reported Minerals
- Antigorite
- Chrysotile
- Talc
- Calcite
- Grossular
- Aragonite
Mineral Assemblages
- Serpentinite - Calcite
- Talc - Grossular - Unspecified
- Antigorite - Chrysotile
Localities
- Hosoyama (Ophicalcite)
- Kimitake Mine (Ni minerals)
- Natsume Mine (Fe-Ni deposit)
- Nakauri mine (Cu-Fe-Ni deposit)
- Ninomiya (Cu-Fe-Ni deposit)
- Sakamoto (Matrix of Tectonic Belt)