SiO2 - Mohs Hardness: 7. Smoky Quartz is an important brown gemstone, and is used in various form of jewelry. It is especially used as ring and pendant centerpieces. Lesser quality stones, often with lighter color, are cut as cabochons or tumbled into beads. Large spheres and carvings are also cut from Smoky Quartz.
UT Department of Environmental Sciences
Mt. Ida, AR
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
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