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Brazil | |
| [Opal-A var. Opal-AN] Menezes, Luiz Alberto Dias (n.d.) Personal communication. |
| Chukanov, Nikita V., Atencio, Daniel, Zadov, Alexander E., Filho, Luis A.D. Menezes, Coutinho, Jose M.V. (2007) Guimarãesite, a New Zn-dominant Monoclinic Roscherite-group Mineral from Itinga, Minas Gerais, Brazil. New Data on Minerals, 42. 11-15 |
Taquaral, Itinga, Minas Gerais, Brazil