Tourmaline from selected localities.
USA | |
| U.S. Geological Survey Professional Paper 297; Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E. |
American Mineralogist, Volume 73, pages 324-337, 1988 | |
Rob Lavinsky specimens | |
U.S. Geological Survey Professional Paper 297 | |
Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E. |