Bauxite is a clay-like substance from which aluminium is obtained.
bauxite in British English
(ˈbɔːksaɪt)
noun
a white, red, yellow, or brown amorphous claylike substance comprising aluminium oxides and hydroxides, often with such impurities as iron oxides. It is the chief ore of aluminium. General formula: Al2O3.nH2O
Word origin
C19: from French, from (Les) Baux in southern France, where it was originally found
bauxite in American English
(ˈbɔksˌaɪt; ˈboʊˌzaɪt)
noun
a soft, claylike sedimentary rock, mainly hydrous aluminum hydroxide, that is the chief ore of aluminum