|
USA | |
| Garske, David (n.d.) Personal Communication. |
| Luetcke, Rolf (n.d.) Personal communication. |
| Luetcke, Rolf (n.d.) Personal communication. |
| Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 81.. |
| [var. Chalcedony] Luetcke, Rolf (n.d.) Personal communication. |
| C. Wellington Rose, II |
| Luetcke, Rolf (n.d.) Personal communication. |
| [var. Rock Crystal] Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 346 |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 151, 346 Frondel, C. (1962), The System of Mineralogy, Vol. III, Silica minerals, Wiley, New York. |
Huachuca placers, Ash Canyon, Cochise County, Arizona, USA