Collection: Amethyst

Most of the Amethyst found today (from Brazil and Uruguay) was formed ~130 to 150 million years ago from ancient lava fields. As lava from volcano's forms and cools, several pockets (cavities) are created which traps gasses and water inside the cavities.   

The color in amethyst comes from color centers in the quartz.  These are created when trace amounts of iron are irradiated (from natural radiation).