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Silica mineral , any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically; one is keatite. Silica minerals make up approximately 26 percent of Earth’s silica , compound of the two most abundant elements in Earth ’s crust, silicon and oxygen, SiO 2. The mass of Earth’s crust is 59 percent silica , the main constituent of more than 95 percent of the known rocks. Silica has three main crystalline varieties: quartz (by far the most abundant), tridymite, and cristobalite. Other varieties include coesite, keatite, and lechatelierite. Silica sand is used in buildings and roads in the form of portland cement, concrete, and mortar, as well as ... Successful SILICA students share their experience at the institute for NID, NIFT and NATA.
