Aluminium arsenate is an

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemist ...

with the formula . It is most commonly found as an octa

hydrate In chemistry, a hydrate is a substance that contains water or its constituent elements. The chemical state of the water varies widely between different classes of hydrates, some of which were so labeled before their chemical structure was understo ...

. 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 Mansfieldite is an uncommon mineral that was named after an american geologist, George Rogers Mansfield. It has been considered a valid specie since 1948. It's a member of the variscite group. Mansfieldite creates a series with scorodite, and it i ...

. Anhydrous form is known as an extremely rare,

fumarolic mineral Fumarole minerals are minerals which are deposited by fumarole exhalations. They form when gases and compounds Deposition (phase transition), desublimate or precipitate out of condensates, forming mineral deposits. They are mostly associated with v ...

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. 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.

References

{{Aluminium compounds Aluminium compounds Arsenates