Manganese-bearing Calcite from selected localities.
USA | |
| 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 |
USA | |
| 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 |