Aluminium arsenate is an inorganic compound with the formula .Aluminum arsenate at Chemister It is most commonly found as an octahydrate. It is a colourless solid that is produced by the reaction between sodium arsenate and a soluble aluminium salt. Aluminium arsenate occurs naturally as the mineral mansfieldite.Chemistry of Arsenic, Antimony, and Bismuth, Edited by N. C. Norman. page 131, Anhydrous form is known as an extremely rare, fumarolic mineral alarsite A synthetic hydrate of aluminium arsenate is produced by hydrothermal method. with the formulation .
Modification of aluminium orthoarsenate was carried out by heating different samples to different temperatures. Both amorphous and crystalline forms were obtained.B. Sharan "A new modification of aluminum ortho-arsenate" Acta Crystallogr. 1959, vol. 12, 948-949. The solubility product was determined to be 10−18.06 for aluminium arsenate hydrate of formula .Fernando L. Pantuzzo, Luciano R.G. Santos, Virginia S.T. Ciminelli "Solubility-product constant of an amorphous aluminum-arsenate phase (AlAsO4·3.5H2O) at 25 °C" Hydrometallurgy Volumes 2014, 144–145, Pages 63–68. Like gallium arsenate and boron arsenate, it adopts the α-quartz-type structure. The high pressure form has a rutile-type structure in which aluminium and arsenic are six-coordinate.
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