Crystals and other natural minerals for collecting, etc. Many beautiful crystals and mineral specimens for purchase for your collection or resale. An aragonite crytal formation is pictured to the left. param.text param.text • Amethyst clusters, Brazil • Amethyst, single point, Brazil • Aragonite crystals, CA • Chevron amethyst, sm. • Dogtooth calcite clusters, UT • Molybdenite, ID • Octahedron, fluorite, small • Phantom chevron amethyst