| Duarte, Lauren C., Hartmann, Leo A., Ronchi, Luiz H., Berner, Zsolt, Theye, Thomas, Massonne, Hans J. (2011) Stable isotope and mineralogical investigation of the genesis of amethyst geodes in the Los Catalanes gemological district, Uruguay, southernmost Paraná volcanic province. Mineralium Deposita, 46 (3) 239-255 doi:10.1007/s00126-010-0323-6 | Journal (article/letter/editorial) | of the genesis of amethyst geodes in the Los Catalanes gemological district, Uruguay, southernmost Paraná...the world-class amethyst-geode deposits of the Los Catalanes gemological district, Uruguay, constrain processes...silica minerals in geodes (chalcedony, quartz, and amethyst) are much larger and the values generally somewhat...producers of amethyst and agate geodes (600 tons/month) are Brazil (Ametista do Sul) and Uruguay (Los Catalanes)...Engenharia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil e-mail: lauren.duarte@ufrgs |
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Catalán Grande Quarry, Catalán Grande, Artigas Department, Uruguay