Tourmaline from selected localities.
USA | |
| U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| US Dept. Of Int. Bur. of Mines ROI #6885 (1967), Williams, R.L.:25. |
Monteverde, et al. (1989) | |
| Rocks & Min.: 17:344. |