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\\Silica is also called the quartzite, silica is the main raw material of the siliceous refractory materials. The main mineral is quartz SiO2. With the silica can be divided into crystalline silica refractory industry (recrystallization quartzite) and cementation silica cementation (quartzite). The purpose of the silica is very wide, sparse nature of crystal could be used in the manufacture of the important components of the electronic industry, optical instrument, and arts and crafts. Silica is the important raw material for manufacturing optical fiber. Generally a pure quartz, can be made from quartz glass. Quartz glass small expansion coefficient, equivalent to 1/18 of the common glass, can withstand the temperature change, good acidproof performance (except for HF), therefore, quartz glass used to make high temperature resistant chemical equipment. Quartz sand used for glass raw materials and building materials. The purpose of the silica is very wide, has been using the main raw materials of high performance fiber optic communications materials is silicon dioxide. Generally a pure quartz can be made from quartz glass. Quartz glass is often used in the manufacture of high temperature resistant chemical equipment. Crystals are commonly used to make the important components of the electronic industry, optical instrument, also used to make advanced industrial products and glass lens.