Amethyst from selected localities.
Switzerland | |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 340. |
| Günther, W. (2010): Amethyst-Neufund am Blattjegrat im Binntall, Wallis (CH). Lapis 35 (4), 21-24. |