TrekGEO > Mineral Trail > Koshinetsu region > Yamanashi pref. > Quartz

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Otome Mine

Yanagidaira, Makioka village, Yamanashi city, Yamanashi pref., Japan

This locality is closed to collecting.

Source for silicon


Length: 30 mm. Prismatic crystals of quartz. The rainbow-color of the right quartz crystal is due to a thin film of iron oxide on the surface. Striations are vertical to the prism elongation.

Recovered from a titanium type rare-element pegmatite associated with S-type (Ilmenite-series) granite. Formed in the late Miocene (9 Ma).

Quartz from this location was described in 1894.

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