... OH)3, ATH, sometimes erroneously called Hydrate of alumina, is found in nature as the mineral gibbsite ( ... under carefully controlled conditions is known as activated alumina and is used as a desiccant, an adsorbent ... aluminium compounds: specialty calcined aluminas, aluminium supfate, polyaluminium chloride, aluminium chloride, zeolites, sodium aluminate, activated alumina, aluminium nitrate. ...