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

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Hirasawa Mine

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

This locality is closed to collecting.

IMA approved name

Orthoclase var. adularia


Field of view: 20 mm. A group of rhombohedral adularia crystals. There are many rhombohedral faces of white adularia.

Recovered from a titanium type rare-element pegmatite in a S-type (Ilmenite-series) margin of I-type (Magnetite-series) granite formed by the reduction reaction of granite magma with pelitic rocks. Formed in the late Miocene (10 Ma),

Adularia from this location was described in 1918.

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