Ikenofukuro
Sakai, Fujimi city, Suwa county, Nagano pref., Japan
Occurrence
Phenocryst of andesite in Pleistocene Shinanosakai Lava. Some lavas of Yatsugatake volcano produce hornblende mega-crystals.
Outcrop of andesite of Shinanosakai Lava. The black crystals are hornblende phenocrysts. The fine white crystals are anorthite phenocrysts. Local people have called dispatched hornblende as "Roppo-ishi", hexagonal stone in Japanese, for more than 100 years.
Reported Minerals
Mineral Assemblages
- Andesite (Host) - Hornblende
Localities
- Mount Hijiri (Lava, Augite)
- Ikenofukuro (Lava, Hornblende)
- Lake Kuttara (Lava, Basaltic)
- Usami (Lava, Xenolith)
- Sukumo river (Dike, Basaltic)
- Tonosawa (Dike, Basaltic)
- Yaga (Dike, Augite)