Minerals & Crystal Systems Home Mineral Specimens at GRI Rhodonite Amazonite Kyanite Bournonite Sulfur Barite Erythrite Azurite Aegirine Realgar Selenite Staurolite Biotite Sphalerite Pyrite Fluorite Amethyst Dioptase Schorl Calcite Smoky Quartz Vanadinite Chalcopyrite Wulfenite Zircon Apophyllite
