| Registros del 1 al 2 de 2 encontrados |
1.- Blue "opal" (or cristobalite?) from Rio Grande do Sul, Brazil
Gemological Institute of America; Santa Monica, CA; USA; United States, 2011
Proceedings of the Fifth international gemological symposium
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2.- Gem materials in the south of Brazil
Gemological Institute of America; Santa Monica, CA; USA; United States, 2011
Proceedings of the Fifth international gemological symposium
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