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sub-categories at whole numbers. close up of black volcanic sand from perissa, santorini , greece the most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica (silicon dioxide, or sio ), usually in the form of quartz , which, because of its chemical
fine grains of sand. the type of rock the sediment originated from and the intensity of the environment gives different compositions of sand. the most common rock to form sand is granite , where the feldspar minerals dissolve faster than the quartz , causing the rock to break apart into small pieces....
https://en.wikipedia.org/wiki/Sand