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Switzerland | |
| Pavel M. Kartashov analytical data 2019, Roberto Bracco material |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 337. |
| Lapis 29(9):33-34 (2004) |
| King, Van (n.d.) Personal communcation. |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 239-240. |
| Rock Currier |
Sorescia Alp, Airolo, Leventina, Ticino, Switzerland