Also known as ground quartz and silica flour, is produced by grinding high-purity quartz, quartzite, sandstone, or silica sand to finer than 45 micron. Air separation is used as required to remove kaolin, mica, feldspar, or calcite impurities. we can crush also reach 45 micron with magnetic separation Uses: 1- glass industry 2- lenses industry 3- television, radio, computer, radar, transmission machine industry 4-pure quartz for photocells 5- semi conductor industry 6-Cleaners 7-Paint 8-cramics: Low-iron ground silica, typically -200 mesh, and calcined silica are used in whiteware formulations to facilitate drying of the body, to control expansion characteristics and compatibility between the body and glaze to prevent crazing, and to provide whiteness and acid resistance. 10-Coatings Ground quartz and novaculite are used as extender pigments because of their low binder demand, which allows high loadings. 11-Rubber Finer (