TrekGEO > Mineral Trail > Kanto region > Gunma pref. > Orpiment

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Nishinomaki Mine

Minami-Nomaki, Shimonita city, Kanra county, Gunma pref., Japan

This locality is closed to collecting.


Field of view: 3 mm. Orpiment associated with realgar. The radial groups of tabular yellow crystals with a resinous luster are orpiment. The surrounding white parts are gangue quartz. The red grains at the upper right are realgar.

Recovered from an open space of a quartz vein in a low-temperature hydrothermal deposit formed by a andesite dike in andesitic tuff breccia filling a caldera. Formed in the late Miocene (6 Ma).

Orpiment from this location was described in 1927.

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