| Proctor, K. (1984). Gem pegmatites of Minas Gerais, Brazil: exploration, occurrence, and aquamarine deposits. Gems and Gemology, 20(2), 78-100. Sauer, Jules Roger (1982) Brazil - Paradise of Gemstones. Gemological Institute of America (GIA) Gübelin, E. and Wolgensinger, M. (1976) Edelstenen. Uitgeverij Artis, Brussel (in Dutch). |
Teófilo Otoni, Minas Gerais, Brazil