[{"from": "human", "value": "Provide a brief overview of this molecule. [O].[O].[O].[Al]"}, {"from": "gpt", "value": "The molecule is the most stable form of aluminium. It is found in nature as the mineral gibbsite (also known as hydrargillite) and its three, much more rare, polymorphs: bayerite, doyleite and nordstrandite. Aluminum hydroxide is used as an antacid and included as an adjuvant in some vaccines. Aluminum is the most abundant metal in the earth's crust and is always found combined with other elements such as oxygen, silicon, and fluorine.  (L739, L740, L756)"}]