Smoky Quartz

Smoky quartz is a variety of quartz that ranges in color from light grayish-brown to nearly black. Its color is due to natural irradiation and the presence of aluminum impurities within the crystal structure. Smoky quartz has a hexagonal crystal system and commonly forms in prismatic crystals with a vitreous luster. It is found in igneous and metamorphic rocks and occurs in regions with significant geological activity, such as Brazil, Switzerland, and the United States. Smoky quartz is valued for its durability and is used in jewelry, carvings, and ornamental objects.