Is Al OH 3 An Acid Or Base?

Is Al OH 3 An Acid Or Base? Aluminium hydroxide, Al(OH)3, is found in nature as the mineral gibbsite (also known as hydrargillite) and its three much rarer polymorphs: bayerite, doyleite, and nordstrandite. Aluminium hydroxide is amphoteric, i.e., it has both basic and acidic properties. Is Ai OH 3 a strong base? Al(OH)3 is not