TrekGEO > Mineral Trail > Tokai region > Gifu pref. > Protolithionite

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Ichiyanagi Mine

Hirukawa, Nakatsugawa city, Gifu pref., Japan

IMA approved name

Li-bearing siderophyllite


Field of view: 10 mm. A group of protolithionite. The micaceous grayish-green crystals exhibiting perfect cleavage are protolithionite. Protolithionite is solid solution between siderophyllite and lepidolite, and present approved name is Li-bearing siderophyllite. The translucent white part at the lower right is gangue quartz. The dark gray part at the upper left is granite, host of the deposit.

Recovered from 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).

Protolithionite from this location was described in 1979.

Other localities

  • Ichiyanagi Mine (Pneumatolytic, Platy)
  • Mount Yagen (Pneumatolytic, Platy)
  • Hirukawa (Skarn, Platy)
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