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USA | |
| Mason, Anita (1976) The World of Rocks and Minerals. Larousse & Co., Inc., New York. |
| Pratt, Joseph Hyde (1933) Gems and gem minerals of North Carolina. American Mineralogist, 18 (4) 148-159 |
| Genth,F.A.,1891,The Minerals Of North Carolina:USGS Bulletion No.74 |
| Wilson, W.F., McKenzie, B.J. (1978) Mineral Collecting Sites in North Carolina. Information Circular 24. North Carolina Division of Mineral Resources NCGS Information Circular 24 |
| Pratt, Joseph Hyde (1933) Gems and gem minerals of North Carolina. American Mineralogist, 18 (4) 148-159 |
| Gems and Minerals of America-Jay Ellis Ransom-1974 |