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I have no idea in which conditions this compound is formed and would like to find out any / different ways it can be prepared (any easy way not requiring expensive equipment would be great).

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Iron(III) arsenate or more commonly Ferric orthoarsenate is normally found in nature in the form of a mineral called Scorodite.

It can also be prepared chemically. From here:

The monohydrate, $\ce{FeAsO4.H2O}$, is precipitated from solution. The salt, when dried in air, is a dull white insoluble substance, containing one molecule of water. When heated at 100° C. it becomes anhydrous. On treatment with sodium hydrogen carbonate solution, both the monohydrate and the anhydrous salt cause effervescence to take place, a soluble double arsenate being produced. It would appear, therefore, that the hydrated salt is acidic, and determinations of its basicity indicate that its formula is $\ce{FeO.AsO2(OH)2}$.

Colloidal ferric arsenate is prepared by the action of ammonium hydroxide on the insoluble salt.

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