Sphalerite from selected localities.
USA | |
| Karlstrom, Thor N.V., MBMG Memoir No. 25 P. 75 |
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; USGS Bull 574 | |
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |