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Brazil | |
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| [var. Imperial Topaz] de Brito Barreto, S. and Bretas Bittar, S.M. (2010) Los depósitos de gemas de Brasil: localización, producción e impacto económico. Boletín de la Sociedad Geológica Mexicana, 62(1), 123-140.
Adusumill, Maria S. (1997) Minerals in Brazilian Jewelry: Inherited and Coveted Art and Culture. Berichte der Geologischen Bundesanstalt. ISSN 1017-8880, Band 41, pp. 15-22.
Sauer, Jules Roger (1982) Brazil - Paradise of Gemstones. Gemological Institute of America (GIA) |
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| Rock Currier |
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| Hussak and Prior (1900) Mineralogical Magazine: 12: 244. |
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| Betts, John (n.d.) John Betts website listing. |
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| King, Van (n.d.) Personal communcation. |
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| Ricardo Scholz information |
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| Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370. |
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| Bancroft, Peter. 1984. "World's Greatest Crystal Treasures" |
Ouro Preto, Minas Gerais, Brazil