|
Uruguay | |
| |
| Giulio Morteani, Y. Kostitsyn, C. Preinfalk, H. A. Gilg (2010) The genesis of the amethyst geodes at Artigas (Uruguay) and the paleohydrology of the Guaraní aquifer: structural, geochemical, oxygen, carbon, strontium isotope and fluid inclusion study. International Journal of Earth Sciences 99:927-947 |
| [var. Agate] Gübelin, E., Wolgensinger, M. (1976) Edelstenen. Uitgeverij Artis, Brussel (in Dutch). |
| [var. Agate] L.C. Duarte, L.A. Hartmann, M.A.Z. Vasconcellos, J.T.N. Medeiros, T. Theye (2009) Epigenetic formation of amethyst-bearing geodes from Los Catalanes gemological district, Artigas, Uruguay, southern Paraná Magmatic Province. Journal of Volcanology and Geothermal Research 184:427–43 |
Artigas, Artigas Department, Uruguay