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Aluminium is a silvery white, soft, ductile metal and the third most abundant element (after Oxygen and Silicon), and the most abundant metal, in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments. Instead, it is found combined in over 270 different minerals. The chief ore of Aluminium is bauxite.