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Smoky Quartz is a variety of Quartz, a silicon dioxide mineral with a hardness of 7. Like other Quartz crystals, Smoky Quartz has a hexagonal (trigonal) crystal system and forms in prisms. Smoky Quartz can vary in color from very pale tan to deep chocolate brown. Its color comes from natural irradiation. Clear Quartz can be made Smoky artificially by treating it with radium or x-rays.