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![](./images/clear.gif) 1.- Geochemical and scintillometric characterization and correlation of amethyst geode-bearing Parana lavas from the Quarai and Los Catalanes districts, Brazil and Uruguay
Cambridge University Press; London; GBR; United Kingdom, 2010
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![](./images/clear.gif) 2.- Stable isotope and mineralogical investigation of the genesis of amethyst geodes in the Los Catalanes gemological district, Uruguay, southernmost Parana volcanic province
Springer-Verlag; Berlin; DEU; Germany, 2011
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