Sphalerite from selected localities.
USA | |
| Minerals of Colorado (1997) Eckel, E. B.; U.S. Geological Survey Professional Paper 1753; Irving, J.D. (1905), Ore Deposits of the Ouray District, Colorado, USGS Bulletin 260: 50-77 |
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The Mines and Minerals of the Great American Rift, R.W. Holmes & M.B. Kennedy, 1983; 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 | |
U.S. Geological Survey Professional Paper 1753 | |
U.S. Geological Survey Professional Paper 1753 |