Mica is one of the rock forming minerals with six square crystalline forms. Its layered cleavage is complete and has a glassy luster, the mica flakes are elastic. The refractive index of mica increases with the increase of iron content, and can rise from low positive to middle protuberance. Mica minerals mainly include Muscovite Mica, biotite, sericite and so on, sand stone is a mixed mineral of mica and quartz. The most widely used industry is muscovite and phlogopite mica.
The non-metallic mineral products are widely found in Asia, Africa, America. Mica has very high insulation, thermal insulation, good chemical stability, acid and alkali resistant and compression ability, so it is an important raw material for manufacturing electrical equipment.