Of all types of dust the most harmful one is silica. Quartz is silicon dioxide and is found in sand and in the majority of natural rocks.  It is also in demolition debris and many building materials. The quartz content varies by type (natural) stone or composite building material. The higher the quartz content of the material, the more silica dust may be released. Of all types of dust the most harmful one is silica. Quartz is silicon dioxide and is found in sand and in the majority of natural rocks.  It is also in demolition debris and many building materials. The quartz content varies by type (natural) stone or composite building material. The higher the quartz content of the material, the more silica dust may be released.

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