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Katsura Island

Kaka, Shimane village, Matsue city, Shimane pref., Japan

Occurrence

Intermediate acidic metasomatic rocks of low-T silicified zone

Chalcedony veins in rhyolite. This rhyolite is a part of the middle Miocene (15 Ma) lava dome of the submarine volcano in the Jyosoji Formation. There are many platy cooling joints. The age was determined by microfossils.

Katsura Island

White chalcedony in rhyolite lava of the Jyosoji Formation. White veins are chalcedony. The brown host is rhyoliteic lava, a part of the lava dome. There are two platy joints from the upper right to the lower left. The chalcedony veins are roughly along the joints faces. Radial aggregates of ferrierite-Mg are in chalcedony at the boundary between chalcedony and rhyolite.

Reported Minerals

  • Ferrierite-Mg
  • Chalcedony

Mineral Assemblages

  • Chalcedony - Ferrierite-Mg

Localities

Related Occurrences

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