Amethyst
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).
Other localities
- Kosaka Mine (Kuroko, Amethyst)
- Urahanda Mine (Hydrothermal, Amethyst)
- Mount Ametsuka (Hydrothermal, Amethyst)
- Manju Mine (Hydrothermal, Amethyst)
- Yashu Mine (Hydrothermal, Amethyst)