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

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Hirasawa Mine

Enzan-Hirasawa, Koshu city, Yamanashi pref., Japan

This locality is closed to collecting.


Field of view: 7 mm. Muscovite associated with quartz. The radial groups of silver-white platy crystals exhibiting perfect cleavage are muscovite. The transparent white parts are quartz.

Recovered from an open space of an alpine fissure in a S-type (Ilmenite-series) margin of I-type (Magnetite-series) granite formed by the reduction reation of granite magma with pelitic rocks. Formed in the late Miocene (10 Ma),

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