Pyrargyrite from
USA | |
| [Rocks & Minerals Vol 68 March/April 1993 p96] |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. David Von Bargen, Rocks & Minerals, Black Hawk Mine (1993) | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Walstrom, Robert E. (n.d.) Personal communication. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |