Smoky Quartz/ Fluorite/ Labradorite/ Chalcedony
Smoky Quartz is a gray, translucent version of quartz that ranges in clarity from almost complete transparency to a brownish-gray crystal that is almost opaque. The translucency results from natural irradiation creating free silicon within the crystal.
Fluorite (also called fluorspar) is the mineral form of calcium fluoride. This piece from Mexico has a beautiful blue and purple color.
Labradorite is feldspar named after the peninsula of Labrador in Canada, where it was first found. Often blue and green, it shows labradorescence which is the metallic tint that makes this piece shine and reflect so radiantly.
Chalcedony- Recent studies have shown that much Chalcedony is a mixture of cryptocrystalline quartz and moganite, another silica mineral related to quartz but with a different crystal structure.