| Switzerland | |
- Grischun (Grisons; Graubünden)
- Bregaglia Valley (Bergell)
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): \"Mineralienlexikon der Schweiz\", Wepf (Basel), p. 427. | |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): \"Mineralienlexikon der Schweiz\", Wepf (Basel), p. 427. | |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): \"Mineralienlexikon der Schweiz\", Wepf (Basel), p. 427. | |
| Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): \"Mineralienlexikon der Schweiz\", Wepf (Basel), p. 427. | | USA | | |
| Rogers, Austin Flint (1912), Notes on rare minerals from California: Columbia University, School of Mines Quarterly: 33: 377; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 224. | |
| Sterrett, Douglas Bovard (1911), Gems and precious stones. Mineral Resources of the United States for 1910, part 2; Department of the Interior, U.S. Geological Survey: 858; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 224. | |
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| AmMin 26:352-381 | |
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