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

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Nishizawa Mine

Kawamata, Nikko city, Tochigi pref., Japan


Field of view: 10 mm. Laumontite associated with quartz, a gangue mineral of the low temperature hydrothermal Au-Ag deposit. The opaque white fine prisms in the void are laumontite. The fine pale brown granules are too small to distinguish.

Recovered from a quartz vein of a hydrothermal Au-Ag deposit associated with rhyolitic tuff breccia, eruption products of a caldera. Formed in the late Miocene (7.2 Ma).

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