Cristobalite from Hokkaidō Prefecture, Japan
Japan | |
| Africano, F., & Bernard, A. (2000). Acid alteration in the fumarolic environment of Usu volcano, Hokkaido, Japan. Journal of volcanology and geothermal research, 97(1), 475-495. |
Africano & Bernard (2000), Jour. Volcanology & Geothermal Research: 97: 475-495. | |
| Fujiwara, T. (1994): Nihon-no-Koubutsu |