Add Yahoo as a preferred source to see more of our stories on Google. Amethyst is one of the most abundant crystals in the world. But the most prized pieces can cost almost a million dollars. Some of ...

Amethyst is a violet variety of quartz which has been used as a gemstone for many centuries and is a key economic resource in northern Uruguay. Geodes are hollow rock formations often with quartz ...

Göttingen University researcher Fiorella Arduin Rode working in open pit mine of the study area, Los Catalanes mining district, northern Uruguay. Along with Ametista do Sul in southern Brazil, these ...