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Switzerland | |
| Amacher, P. (1987): Mineralienfreund 25(2), 25-30. |
| Neschen, Peter (n.d.) Personal communication. |
| www.mineralienatlas.de (n.d.) https://www.mineralienatlas.de/lexikon/index.php/Schweiz/Tessin%2C%20Kanton/Leventina%2C%20Bezirk/Airolo%2C%20Kreis/Airolo/Val%20Tremola/Pizzo%20Posmeda |
| www.mineralienatlas.de (n.d.) https://www.mineralienatlas.de/lexikon/index.php/Schweiz/Tessin%2C%20Kanton/Leventina%2C%20Bezirk/Airolo%2C%20Kreis/Airolo/Monte%20Prosa |
| Gerhard Niceus collection |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 355. |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 68 |
| Stephan Wolfsried collection |
Ovi di Scimfuss, Pontino Alp, Tremola Valley, Airolo, Leventina, Ticino, Switzerland