Silicon dioxide or Silica:
Silicon dioxide oxide compound with the chemical formula SiO2 abundant in the earth’s crust that both sedimentary rocks and quartz are used in industry:
Silica Quartz: Quartz is one of silica titanium dioxide. This phase is stable at normal temperature and pressure. Because of free silica as quartz is found in nature more. Mineral quartz is very high hardness, is about 7 mouse.
Precipitated silica: Sand, sandstone, quartz types of sediment that naturally been crushed. In sandstone, sand grains by the particles of lime, clay, iron oxide or other materials stuck together.