Chalcopyrite from selected localities.
USA | |
| U.S. Geological Survey Professional Paper 223; 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 |
Minerals of Colorado (1997) E.B. Eckel; William Crowley Kelly, Edwin Newell Goddard (1969) Telluride Ores of Boulder County, Colorado. GSA Memoir 109. | |
U.S. Geological Survey Professional Paper 223 |