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A silver-white soft metal, noted for its lightness, high reflectivity, high thermal conductivity, non-toxicity, and corrosion resistance. It is the most abundant metallic element, comprising about 1/12th of the earth’s crust. It is never found in nature as an elemental metal, but only in combination with oxygen and other elements. In ordinary commercial and industrial use, the word “aluminum” is often understood to mean aluminum alloy, rather than the pure metal.