Bauxite

Frae Wikipedia
Lowp tae: navigation, rake
Bauxite wi US penny for comparison

Bauxite, an aluminium ore, is the warld's main soorce o aluminium. It consists maostly o the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) an diaspore α-AlO(OH), mixed wi the twa airn oxides goethite an haematite, the clay mineral kaolinite an smaa amounts o anatase TiO2.