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Silicon dioxide, crystalline structure. Molecular model showing the basic tetrahedral co-ordination and crystalline structure of silicon dioxide (chemical formula: SiO2), also known as silica. The atoms are colour-coded: silicon (silver) and oxygen (red). Each silicon atom has tetrahedral co-ordination with four oxygen atoms, but in the overall quartz crystal structure each oxygen atom is shared with another silicon atom. Silicon dioxide, most commonly found as quartz, has a wide range of applications.
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