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Silicon dioxide, chemical formula SiO2, if that's the substance you were thinking of, is the oxide of silicon. At room temperature, it is a clear, hard, brittle glassy substance. In fact, SiO2 is the main ingredient in window glass, the other one being lime. It forms the mineral quartz. Quartz granules are the main component of sand.

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Q: What are the chemical properties of silicon dioxide?
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