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ALUMINIUM CHEMISTRY
(i)  Aluminium is the 3rd most abundant element in the crust (after O & Si) at 8.1%
• Al is the most common metallic element, occurring in aluminosilicates such as micas and feldspars, in bauxite (Al2O3.nH2O) a hydroxy-oxide and in cryolite (Na3AlF6).
(ii) Aluminium is a hard, strong, white metal:  although highly active it is resistant to corrosion because a film of oxide is rapidly formed on the surface. 
Uses: Aluminium is widely used as a structural metal. The properties of light weight, corrosion resistance and formation of strong alloys make this a useful metal.