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    • Waste generation in agate processing : use of SiO2 as a support matterial [sic] for Fe3O4 

      Folle, Daiane; Silva, Rodrigo de Almeida; Boita, Jocenir; Robaldo, Douglas Luis Carissimo; Schneider, Ivo Andre Homrich (2015) [Journal article]
      Brazil is one of the main producers of colored gemstones, and Rio Grande do Sul is the state with the greatest production of agates, amethysts and citrines. This sector is preponderant in the economy of the regions of the ...