where can quartz be found in the us
Quartz Naturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing silicon wafers in the semiconductor industry, are expensive and rare. A major mining location for high purity quartz is the Spruce Pine Gem Mine in Spruce Pine, North Carolina, United States.[27] Quartz may also be found in Caldoveiro Peak, in Asturias, Spain.[28]