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Gratonite

Yunosawa Mine

Ikarigaseki, Hirakawa city, Aomori pref., Japan

This locality is closed to collectors.

Gratonite

Field of view: 5 mm. Gratonite associated with jordanite. The prismatic crystal is gratonite encrusted with white clay. The surrounding host is jordanite covered with white clay.

Recovered from an open space of a sulfide vein in a moderate-temperature hydrothermal deposit associated with rhyolitic welded tuff in a caldera complex. Formed in the late Pliocene (3.5 Ma).

The first gratonite from Japan was reported from this location in 1984.

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