Cyrtolite from South America
Bolivia | |
| Federico Ahlfeld & Jorge Munoz Reyes: Las Especies Minerales de Bolivia (Banco Minero de Bolivia, 1955) |
Brazil | |
| Lagache, M., Quemeneur, J. (1997) The Volta Grande Pegmatites, Minas Gerais, Brazil; an example of rare-element granitic pegmatites exceptionally enriched in lithium and rubidium. The Canadian Mineralogist, 35 (1) 153-165 |