What Is the Chemical Formula for Sand?

In non-tropical regions, silica is the primary component of sand, hence the chemical formula for sand is SiO2. The ratio of silicon atoms to oxygen atoms in silica is one to two.

This silica typically exists in the form of quartz in sand. Quartz possesses the chemical formula SiO2 and a crystal structure in which each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms. In some nations, sand also contains calcium carbonate. CaCO3 is the chemical formula for calcium carbonate.

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