TrekGEO > Mineral Trail > Kanto region > Tochigi pref. > Adularia

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Manju Mine

Shimo-Terashima, Shioya city, Shioya county, Tochigi pref., Japan

IMA approved name

Orthoclase var. adularia


Field of view: 10 mm. Euhedral crystals of adularia. Rhombohedral white adularia crystals are perched on the fine adularia crystals.

Recovered from an open space in an adularia vein of a moderate-temperature hydrothermal deposit associated with a rhyolite dike intruded in welded tuff. Formed in the middle Miocene (15 Ma).

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