Cape Osaki
Usami, Ito city, Shizuoka pref., Japan
Occurrence
Hydrothermal veins associated with basalt lava of the Late Pleistocene (0.9 - 0.4 Ma) Usami volcano. The basalt lava covers Andesite.
Outcrop of basalt associated with low temperature hydrothermal veins. The grayish white host is basalt including white phenocrysts of anorthite. The black vein with a red tint is the hydrothermal vein formed in joints of basalt, and is mainly composed of .Ranciéite.
Reported Minerals
- Ranciéite
- Anorthite
Mineral Assemblages
- Hydrothermal vein - Ranciéite
- Basalt (Host) - Anorthite
Localities
- Tabi (Metasomatism, Braunite)
- Ikeshiro Mine (Metasomatism, Todorokite)
- Cape Osaki (Basalt lava, Ranciéite)