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While most rose quartz is mined in Minas Gerais, especially Araguai, the best quality 'stones Samiresy, Antsirabe, central Madagascar. Other sources include Vama, Nuristan, northeast Afghanistan; Quadeville, Renfrew County, Ontario, Canada; and the Bavarian Forest of southern Germany. Major US sites include Fremont County, Colorado; Oxford County, Connecticut; and Grafton, New Hampshire. SMOKY QUARTZ Smoky quartz is one of the rare brown gemstones - the others being smoky TOPAZ, black BERYL and brown CORUNDUM. like other varieties of quartz, it has been used and appreciated since ancient times because it is easy to cut as a gem and equally easy to shape for ornaments and practical applications. Smoky quartz occurs in many igneous and metamorphic rocks, particularly in granite and gneiss. It is often found in quartz veins and granite pegmatic dykes. It also often occurs in granitic rocks that have small amounts of radioactivity. While the cause of its colour is not known for certain, it is believed that smoky quartz is brown to 'grey because it has been exposed to radiation. In fact, it can be made in the laboratory by explosing clear ROCK CRYSTAL to low-grade radiation (this effect can be reversed by heating).