Sphalerite from selected localities.
USA | |
| Lindgren, W. and Ransome, F.L. (1906) Geology and gold deposits of the Cripple Creek district, Colorado. United States Geological Survey Professional Paper 54: 297-305. |
| USGS Professional Paper 54 |
Minerals of Colorado (1997) E.B. Eckel | |
Min Rec 36:2 pp143-185 |