Question

Differences between diamond and silicon dioxide

Answer 1

Diamond is essentially carbon, anything present other than carbon is a contaminant. Silicon dioxide is just that: SiO2. Anything else present is as a contaminant.

Answer 2

Differences between diamond and silicon dioxide are as follows.
Both silicon and diamond are non-molecular materials, and each consists of tetrahedral carbon or silicon in a tetrahedral array. Because #Si-Si# bonds are longer than #C-C# bonds we would predict that less energy is required to disrupt them, and that therefore, the melting point of elemental silicon should be lower than that of diamond.
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