Suwa Mine
Kitayama, Chino city, Nagano pref., Japan
Occurrence
Goethite-Jarosite deposit, Bog iron deposit, formed from the Fe- and SO4-rich hot spring on Kitayama Lava of Northern Yatsugatake volcanos. Goethite is still depositing in a part of the territory. It is considered that goethite was deposited by bacterial iron biomineralization of Fe ion in the hot spring water.
Outcrop of Bog Iron, Goethite-Jarosite deposit. The brown part is spongy goethite. The yellowish part is rich in jarosite. There are many plant impression fossils in goethite.
Reported Minerals
- Goethite
- Jarosite
- Cacoxenite
- Koninckite
- Strengite
- Tinticite
Mineral Assemblages
- Goethite - Jarosite
- Goethite - Cacoxenite
- Goethite - Koninckite
- Goethite - Strengite
- Goethite - Tinticite
History
- 1940-1945: Fe was mined during World War II.
Localities
- Naka-Toya Mine (Goethite)
- Sukayu (Hematite)
- Suwa Mine (P rich)
- Gunma Mine (Hematite)
Related Occurrences
- Travertine (Calcareous sinter)
- Siliceous sinter
- Sulphur sinter
- Vitriolic sinter