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Quartz/Japan Twin

Kobushi Mine

Azusayama, Kawakami city, Minami-Saku county, Nagano pref., Japan

This locality is closed to collecting.

Source for silicon

Japan Twin

Left twin: 5 mm. Japan twins of quartz. The left twin is perched on a small prism of quartz. The right crystal is a part of a broken twin.

Recovered from skarn formed by contact metamorphism of S-type (Ilmenite-series) diorite.

Quartz from this location was described in 1953.


Lower right crystal: 10 mm. Transparent to white quartz crystals.

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