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Ichiyanagi Mine

Hirukawa, Nakatsugawa city, Gifu pref., Japan


Field of view: 10 mm. Topaz associated with protolithionite. The transparent prisms vertical to the vein wall at the top are topaz. The massive white part with a vitreous luster at the bottom is gangue quartz. The micaceous dark green crystals are protolithionite.

Recovered from a quartz vein in 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).

Topaz from this location was described in 1979.

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