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Precious Opal from South America

Brazil
 
  • Pará
    • São Geraldo do Araguaia
Revista Brasileira de Geociências 30(2):251-255, junho de 2000
  • Piauí
    • Nazaré do Piauí
[var. White Opal] Costa, M. L. D., Alencar, Q. D. S., Gomes, E. R., Almeida, H. D. F. D., & Oliveira, S. K. D. (2016). Textural patterns, mineralogy, and chemistry of sandstone-related Calçadinha chalcedony (Piauí, Brazil). Brazilian Journal of Geology, 46(3), 395-409.
    • Pedro II
Site description
Sauer, Jules Roger (1982) Brazil - Paradise of Gemstones. Gemological Institute of America (GIA)
 
矿物 and/or 产地  
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