aluminium raw ore in nature, laterite, giglio island, italy

alteration aluminium aluminum antic bath bauxite beach blue boehmite carbonate castle chemical clay cliffs clouds coast concretionary country detail diaspore diving environment erosion europe exotic forest geology gibbsite giglio green ground gulf hematite historic historical history hydrargillite hydroxide industry island italy kaolinite karst landscape laterite lateritization leaching market material medieval mediterranean metal mine mineral mixture mountains nature ore oxisol pisolite pisolith port quarry red reef resource rock sample sedimentary soil source stone summer travelling trees tuscany view voyage weathering