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The chemical formula of Silicon Dioxide SiO2 is SiO2. Silicon Dioxide SiO2 has two forms: crystalline and amorphous. Silicon Dioxide SiO2 existing in nature such as quartz and quartz sand are collectively referred to as silica. Pure quartz is a colorless crystal, large and transparent prismatic quartz crystals are called crystals, purple crystals containing trace impurities are called amethysts, and light yellow, golden and brown ones are called smoky crystals. Chalcedony, agate, and jasper are colored quartz crystals that contain impurities. Sand is fine grains of quartz mixed with impurities. Opal and diatomaceous earth are amorphous Silicon Dioxide SiO2.

Silicon Dioxide SiO2 has a wide range of uses, mainly used for making glass, water glass, pottery, enamel, refractory materials, airgel felt, ferrosilicon, molding sand, elemental silicon, cement, etc. In ancient times, Silicon Dioxide SiO2 was also used to make porcelain The glaze and carcass. Ordinary stones are mainly composed of Silicon Dioxide SiO2 and calcium carbonate.