Blue Ribbon Exotic Environments Geode Stone Purple 4.5 in

Blue Ribbon Exotic Environments Geode Stone Purple 6.5 inches. Blue Ribbon Exotic Environments Geode Stone Purple 6.5 inches. Geodes form in gas bubbles such as lavas, or in rounded cavities in sedimentary formations. After rock around the cavity hardens, dissolved silicates and/or carbonates are deposited on the inside surface allowing crystals like purple Amethyst to form inside the hollow chamber. Safe and non-toxic.