Aluminium phosphate (AlPO₄) is a chemical compound. The anhydrous form is found in nature as the mineral berlinite. Many synthetic forms of anhydrous aluminium phosphate are known. They have framework structures similar to zeolites and some are used as catalysts or molecular sieves. The dihydrate, AlPO₄·2H₂O is found as the minerals variscite and meta-variscite. A synthetic hydrated form, AlPO₄·1.5H₂O is also known. Commercially, an aluminium phosphate gel is available.