The formula of iron (III) sulphate is Fe2(SO4)3.
Iron (III) Sulfate
Iron (III) Sulfate has yellow colour and is water-soluble. It can be found in a range of minerals, but it is most commonly found in marcasite and pyrite. Ferric sulphate is most commonly extracted from nature, but it can also be made by heating ferrous sulphate with sulphuric acid.