Amethysts are a type of quartz, recognizable by their striking ... vast reserves as well as the gemstone quality and variety. Amethyst geodes (some over 16 feet high!) are located in cooled ...

Amethyst is one of the most abundant crystals in the world, but the most prized pieces can cost almost a million dollars. Some of the world's largest amethyst geodes come out of Artigas, Uruguay.