Alunogen
Yoshimi city, Hiki county, Saitama pref., Japan
Field of view: 10 mm. A botryoidal group of alunogen. The white botryoidal crust is alunogen. The grayish-green grains on alunogen is fragments of the host tuff.
Recovered from a rhyolitic tuff bed in a dry climate. Formed in less than 6 months.
Alunogen from this location was described in 1993.
Other localities
- Yoshimi-Hyakuana (Evaporite, Botryoidal)
- Sagiri Valley (Evaporite, Botryoidal)