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Kaolin (Kaolinite) is a hydrous aluminosilicate, appears as odourless white to yellowish or greyish powder. It contains mainly the clay mineral kaolinite (Al2O3 (SiO2)2(H2O)2). Kaolinite has mp 740-1785°C and density 2.65 g/cm3. Kaoline is insoluble in water but darkens and develops an earthy odour when wet. It is widely used in the production of paper, rubber, paint, drying agents, and many other products.