... point 1730 ° C, the melt cooled into a quartz glass, crystal crystal, with a thorough over ultraviolet light and piezoelectric.Two. The ... , whetstone, and sandpaper, and carbonated silicon abrasive material; quartz sand are mostly used to cut stone, polished glass, ... optical and ultraviolet radiation can produce a variety of optical instruments and medical quartz lamp, and also the manufacture of ...