Gypsum from Tokyo Metropolis, Japan
Japan | |
| Field observations, Dr Amir Akhavan, 4-2014. |
| Transparent crystals to 3.5cm in fissures of rock ejected in 1901 explosion. Ref: Wada T. (1904): Minerals of Japan |
| Wada (1904): Minerals of Japan. Swallowtail twin crystals. |
| Wakimizu, T. (1908). The ephemeral volcanic island in the Iwojima group. |