Freibergite Subgroup from Paradox Basin, North America Plate
USA | |
| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |
| Eckhard D. Stuart (self collected 8/20/09 PXRD A. Kampf) |
| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |