TrekGEO > Mineral Trail > Koshinetsu region > Nagano pref. > Cristobalite

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Mugikusa Pass

Kami, Sakuho city, Minami-Saku county, Nagano pref., Japan

This locality is in National Park


Field of view: 5 mm. Cristobalite associated with obsidian. The pink spherules are radial aggregates of cristobalite. The black to white host is obsidian.

Recovered from obsidian associated with a rhyolite lava. Formed in the Middle Pleistocene (0.3 Ma).

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