Noble opal, stone known by its play-of-colors, has its main brazilian deposits in the Piauí town Pedro II. The variety fire opal also occurs in some regions.


  • Title: Rough Opal
  • Creator: Andrea Ferreira
  • Date Created: 2021-03-30
  • Location Created: Jazida de Boi Morto, Pedro II, Piauí - Brasil
  • Physical Dimensions: 5,1x3,3x2,5
  • Type: SiO2·nH2O - Silicates
  • Rights: MM Gerdau - Museu das Minas e do Metal
  • Medium: Mineral

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