Amethyst Free standing Geode 3 inch Piece 09

"3 inch Amethyst piece #09 from Uraguay, the color is deep purple. It is about 3 inches tall. The base has been cut so that it will stand by itself. Amethyst belongs to the quartz family of minerals. Its Chemical formula is silicon dioxide SiO _2. The purple color comes from irradiation and mineral impurities. Like other quartz crystals amethyst forms crystals as 6 sided prisms. Uraguayan amethyst is less available and considered of superior quality to Brazilian amethyst. You won't be disappointed in this beautiful and energetic crystal."