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.

The three-meter tall amethyst geode - a hollow rock filled with amethyst crystals - is the main attraction at the Crystal Caves at Atherton, southwest of Cairns. But it's now missing a bit after a ...

In general, mineral particles are small, having formed within confined areas such as lava flows or between grains of sediments. Large crystals found in geodes ... (At one time, amethyst was ...

Northern Uruguay is home to one of the largest amethyst ... geode-hosted water in over 30 mines. The study involved high-tech techniques including nucleation-assisted microthermometry (to examine ...