Gypsum

Naka-Okorogara, Nikko city, Tochigi pref., Japan

Field of view: 5 mm. Gypsum associated with limonite. The white prism is gypsum. The massive brown host is limonite. The green parts are malachite, and the pale blue parts are Cupro-allophane.

Recovered from a meteoric oxidation zone of a moderately high-temperature hydrothermal deposit associated with welded tuff.

Other localities

List of Japanese gypsum localities

Chichibu Mine (Hydrothermal Skarn, Radial)
Hitachi Mine (Besshi, Tabular)
Okorogawa Mine (Hydrothermal, Prismatic)
Su river (Smectitization, Prismatic)
Uenohara (Mudstone, Radial)
Kodo (Mudstone, Granular)
Desert Cave Hotel (Shale, Hairy)