Silicon dioxide
chemical compound
(Redirected from Silica)
Silicon dioxide, also known as silica, is a chemical compound, the oxide of silicon. Its chemical symbol is SiO2. It is known for its hardness since the 16th century. It has an important compound used in most types of glass and other hard substances such as concrete, porcelain and stoneware. It is made up of 2 oxygen atoms and 1 silicon atom.
Silicon dioxide exists in nature in a number of forms, including flint, quartz and opal. If it is breathed in as dust, it can cause silicosis and cancer, as the dust is trapped in the lungs. Besides the dangers of inhaling it in dust form, it is harmless.
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