common sources of ion of iron(III) cation vs iron(II) cation

iron(III) cation iron(II) cation | common sources of ion

iron(III) cation | iron phosphide (3:1) (1 eq) | iron(III) sulfate hydrate (2 eq) | iron(III) phosphate tetrahydrate (1 eq) | iron(III) perchlorate hydrate (1 eq) | iron(III) oxalate hexahydrate (2 eq) | iron(III) nitrate nonahydrate (1 eq) | hemin (1 eq) | diironnonacarbonyl (1 eq) iron(II) cation | triirondodecacarbonyl (1 eq) | iron(II) sulfate hydrate (1 eq) | iron phthalocyanine (1 eq) | iron(II) molybdate (1 eq)