Scopel RM, Formoso MLL, Meurnier A, Dudoignon P. Hydrothermal alteration related to vein filling in amethyst-bearing basaltic rocks-São Gabriel/Planalto - RS. CeN [Internet]. 1990 Dec. 10 [cited 2024 Sep. 29];12(12):111-8. Available from: https://periodicos.ufsm.br/cienciaenatura/article/view/26260