It is a colourless solid that is produced by the reaction between sodium arsenate and a soluble aluminium salt.

[3] Anhydrous form is known as an extremely rare, fumarolic mineral alarsite[4] A synthetic hydrate of aluminium arsenate is produced by hydrothermal method.

[5] Modification of aluminium orthoarsenate was carried out by heating different samples to different temperatures.

[6] The solubility product was determined to be 10−18.06 for aluminium arsenate hydrate of formula AlAsO4·3.5H2O.

The high pressure form has a rutile-type structure in which aluminium and arsenic are six-coordinate.