Kawaba Mine
Yachi, Kawaba city, Tone county, Gunma pref., Japan
Synonym
Koseki-yama
Occurrence
I-type (Magnetite-series) skarn
Skarn formed by early Paleocene (65 Ma) Akakuradani Granite intruded in Kawaba Metamorphic rocks of Katashina Belt. The Akakuradani Granite is I-type (Magnetite-series) and is approximately 1.5 km apart from the mine. Limestone, the host of the skarn, is a member of Kawaba Metamorphic rocks. Age of granite was determined by K-Ar radiometric dating.
Outcrop of garnet skarn inKawaba Metamorphic rocks. The outcrop is mainly composed of andradite with a small amount of epidote. The prismatic black crystals in this photograph are hedenbergite. The surrounding host is composed of massive andradite. Fibrous ferro-ferri-hornblende is associated with andradite.
Reported Minerals
- Andradite
- Calcite
- Quartz
- Ferro-ferri-hornblende
- Epidote
Mineral Assemblages
- Andradite - Hastingsite - Quartz
- Andradite - Epidote
- Calcite
History
- 1930's: The deposit was discovered.
- 1941: The deposit was began to mine.
- 1970's: Andradite was mined for abrasives.
Localities
- Kawaba Mine (Andradite)
- Shiroishi Pass (Marble)
Related Occurrences
- Skarn (I-type, Magnetite-series)
- Skarn (S-type, Ilmenite-series)
- Skarn (Sanidinite facies)
- Dolomite Skarn
- Skarn (Metasomatic)
- Skarn (Pneumatolytic)
- Skarn (High-T Hydrothermal)
- Skarn (Moderately high-T Hydrothermal)
- Skarn (Moderate-T Hydrothermal)
- Skarn (Moderately low-T Hydrothermal)