Silicon oxide may refer to either of the following:
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Silicon dioxide
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula , most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand. Silica is one ...
or quartz, SiO
2, very well characterized
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Silicon monoxide, SiO, not very well characterized
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