Beryl from selected localities.
USA | |
| U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. | |
| SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills" |
| Smith, Arthur E., Fritzsch, Eric (2000) South Dakota. Rocks & Minerals, 75(3), 156-169. |