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Switzerland | |
| Christian Bracke Collection. |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 407. |
| Wilson, Wendell E. (2023) Alpine Anhydrite from the Simplon Tunnel, Switzerland. The Mineralogical Record, 54 (4) 479-500 Weibel, M. (1990): Die Mineralien der Schweiz, 165. |
Simplon pass area, Brig, Valais, Switzerland