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Switzerland (FRL) | |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 298. Keusen, H.R., Peters, T. (1980) Preiswerkite, an Al-rich trioctahedral sodium mica from the Geisspfad ultramafic complex (Penninic Alps). American Mineralogist: 65: 1134-1137. |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 310. |
| Godard, Gaston, Smith, David (1999) Preiswerkite and Na-(Mg,Fe)-margarite in eclogites. Contributions to Mineralogy and Petrology, 136 (1) 20-32 doi:10.1007/s004100050521 |
Geisspfad pass, Geisspfad area, Binn, Goms, Valais, Switzerland