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

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Hirukawa, Nakatsugawa city, Gifu pref., Japan

This locality is closed to collectors.

IMA approved name

Opal var. hyalite


Field of view: 3 mm. The reniform transparent group is hyalite. The black basement is a prism of black quartz.

Recovered from a pocket of a Topaz-NYF pegmatite associated with S-type (Ilmenite-series) granite. Formed in the Late Cretaceous (67 Ma).

Hyalite from this location was described in 1939.

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