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· Silica is another name for silicon dioxide, SiO2, of which quartz is a specific latticed structure. So silica sand is quartz that over the years, through the work of water and wind, has been broken down into tiny granules.
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Quartz is the most common form of crystalline silica and the most commonly used industrially.  Cristobalite also has important industrial uses. Tridymite is found in rocks and is not an important industrial product. 
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