Pyrite from selected localities.
USA | |
| U.S. Geological Survey Professional Paper 1753 |
| U.S. Geological Survey Professional Paper 1753 |
Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office | |
U.S. Geological Survey Professional Paper 1753 | |
| Rocks & Min.: 64:210. |
Rocks & Min 70:5 pp 298-310; 2008 New Mexico Mineral Symposium abstracts; Rob Lavinsky (ex. George Fisher specimen - noted Colorado specialist) | |
Rocks & Minerals 70:180-187 | |
U.S. Geological Survey Professional Paper 1753 |
Portland Mine, The Amphitheater, Ouray Mining District, Ouray County, Colorado, USA