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quartz - the granddaddy of crystals

quartz seal, afghanistan, c. 1200 ad; a kufic inscription

compositionsilicon dioxide
name sourcefrom the Saxon querkluftertz, meaning "cross-vein ore"
other accepted namesalpha-quartz, silica, Brazilian pebble, rock crystal
historical aliases"ice of the Gods"
folkloric aliases"stone of power"
color clear quartz (the most common), and many other colors
significant sourceseverywhere in the world
MOH scale7
care and treatmentWash in warm soapy water or in ultrasonic jewelry cleaner.