Just want to clarify what you mean by sand , sand is the size of the particle , clay particles are small then its silt particles then sand in size then I guess fine aggregate pebbles .
Some sand may contain silicon ie Silica oxide SiO2 other sand may not contain any silicon at all
Likewise silt could be SiO2 or it could be Aluminium oxide with no silicon .
Ann: Altech - Breakthrough Silicon Alumina Coating Development, page-218
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