More information: Fiorella Arduin-Rode et al, World-class amethyst-agate geodes from Los Catalanes, Northern Uruguay: genetic ...

Montana is called the Treasure State for a reason, known for its thousands of years of mining history and over five hundred ...

Along with Ametista do Sul in southern Brazil, these regions are the world’s leading mining districts for gems which come from volcanic lava, such as amethyst and agate geodes.