The 2.5 tons Empress of Uruguay is slightly less impressive after a tourist pinched a piece of the world's largest amethyst on show in Queensland, Australia. The three-meter tall amethyst geode ...

Amethyst geodes (some over 16 feet high!) are located in cooled lava flows. These ancient lava flows can be traced to the breakup of the supercontinent Gondwana some 134 million years ago.

Amethyst . A member of the quartz family, amethysts with intense, rich purple shades have long been considered the most ...