Opal from selected localities.
Hungary | |
| Szakáll & Jánosi: Minerals of Hungary, 1995 |
| Koch: Minerals of Hungary, 1985 |
Szakáll & Jánosi: Minerals of Hungary, 1995 |
Hungary | |
| Szakáll & Jánosi: Minerals of Hungary, 1995 |
| Koch: Minerals of Hungary, 1985 |
Szakáll & Jánosi: Minerals of Hungary, 1995 |