Allophane
Araya, Aga city, Higashi-Kambara county, Niigata pref., Japan
Field of view: 5 mm. A botryoidal crust of light gray allophane.
Recovered from a meteoric oxidation zone of a moderate-temperature hydrothermal deposit associated with rhyolite. Formed in less than 50 years after the mine was closed,
Other localities
- Okorogawa Mine (Cupro-Allophane, Dendritic)
- Mikawa Mine (Allophane, Botryoidal)