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nature. instead, it occurs mostly as silicon dioxide, more commonly known as sand or quartz, or in silicate minerals, generally in the found in the forms of clay or rock. it was first proposed that silica sand was likely the oxide of a previously unknown element by antoine lavoisier in . in , sir humphry
silica sand mixed with gravel and cement produces concrete. sand is also used widely as an abrasive and as a filler in plastics, rubber, and paints. additionally, diatomaceous earth, a form of silica rock consisting of fossilized remains of diatoms, has many direct commercial applications, especially...
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