Gypsum
Kodo, Ueda city, Nagano pref., Japan
Field of view: 3 mm. Granular gypsum. The clear granular crystals are gypsum. The black basement is the host mudstone.
Recovered from marine mudsone. Formed in Miocene (13 Ma).
Gypsum from this location was described in 1923.
Other 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)