BEN JOHNSON / SCIENCE PHOTO LIBRARY BEN JOHNSON / SCIENCE PHOTO LIBRARY
Sample of bauxite. Bauxite is not a specific mineral, but is a term used to described rock composed of various hydrated aluminium oxides. It is found as an aggregate; largely of gibbsite, boehmite and diaspore. It is a sedimentary material formed after the selective dissolution of surrounding carbonates and silica. Bauxite aggregates are typically light and fragile, with an earthy texture. The reddish colour comes from iron oxide impurities The main ore of aluminium, bauxite is extensively mined in the Caribbean, South America, Indonesia and the CIS.
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