Fluorite

Hirukawa, Nakatsugawa city, Gifu pref., Japan

Field of view: 10 mm. Purple fluorite associated with quartz. The purple grains are fluorite, and the surrounding transparent host is gangue quartz.

Recovered from a quartz vein of a pneumatolytic deposit formed near the boundary between welded tuff and S-type (Ilmenite-series) granite, members of a caldera complex. Formed in the Late Cretaceous (70 Ma).

Fluorite from this location was described in 1938.

Other localities

List of Japanese fluorite localities

Hirukawa (Pegmatite, Octahedral)
Hiraiwa Mine (Hydrothermal, Dodecahedral)
Goka Mine (Hydrothermal, Massive)
Takatori Mine (Pneumatolytic, Massive)
Takane Mine (Pneumatolytic, Massive)
Kamioka Mine (Pneumatolytic Skarn, Cubic)