Arai
Minano, Minano city, Chichibu county, Saitama pref., Japan
Occurrence
Greenschist facies serpentinite
Serpentinite in Mikabu Unit of Sanbagawa Belt. This serpentinite block is lens-shaped and is concordant with schistosity of Sanbagawa Metamorphic Rocks.
Outcrop of serpentinite in Mikabu Unit. The dark green host is serpentinite, and the grayish-green veins are antigorite. Antigorite is fibrous and elongated obliquely to the vein wall. Microscopic jadeite has been reported from this outcrop.
Reported Minerals
- Antigorite
- Diopside
- Jadeite
Mineral Assemblages
- Serpentinite - Antigorite
- Diopside
- Serpentinite - Jadeite
Localities
- Orihara (Talc, High-P)
- Matsunaga Mine (Talc, High-P)
- Shiraki (Pectolite, High-P)
- Arai (Diopside, High-P)
- Osaka (Ophicalcite, High-P)
- Miyazawa (Dolomite, High-P)
- Onara (Fe-Ni, High-P)
- Yashio mine (Fe-Cr, High-P)