Pyrite from selected localities.
USA | |
| U.S. Geological Survey Professional Paper 223 |
U.S. Geological Survey Professional Paper 223 | |
| U.S. Geological Survey Professional Paper 223 |
USA | |
| U.S. Geological Survey Professional Paper 223 |
U.S. Geological Survey Professional Paper 223 | |
| U.S. Geological Survey Professional Paper 223 |