TrekGEO > Mineral Trail > Tohoku region > Akita pref. > Amethyst

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Kosaka Mine

Kosaka-Kozan, Kosaka city, Kazuno county, Akita pref., Japan

IMA approved name

Quartz var. amethyst

Source for silicon


Field of view: 30 mm. Amethyst associated with baryte. The radial groups of the pale purple prisms at the right are amethyst. The pale brown host is also massive amethyst encrusted with limonite. The tabular transparent crystals on amethyst are baryte.

Recovered from an open space of a Kuroko Massive Sulfide deposit associated with a caldera. Formed in the early Miocene (17 Ma).

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