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Kaolin is a hydrated aluminium silicate crystalline mineral formed over many millions of years by the hydrothermal decomposition of granite rocks. It is a white soft mineral composed primarily Kaolinite mineral having chemical composition of Al 2 O 3 .2SiO 2 .2H 2 O with minor amounts of quartz, feldspar and sheet silicate minerals (mica, illite, smectite).