O caráter dicotômico da produção de ametista no Estado do Rio Grande do Sul

Edison Antonio Alberti, Gustavo Siqueira da Silva, Janete Teresinha Reis, Carlos Alberto da Fonseca Pires
2018 Ciência e Natura  
In this paper is presented a brief revision of some gems from Rio Grande do Sul state (Brazil) where the following general aspects are outstanding: geology, mineralogy and trade. Some points of view about security in the job, health, processing and industrialization, as well as organization of cooperatives are also presented.
doi:10.5902/2179460x27245 fatcat:gl6bmcgic5hfpas5qz3bn5b3ce