common sources of ion of iron(III) cation vs chromate anion

iron(III) cation chromate anion | 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) chromate anion | potassium chromate (1 eq) | nickel chromium oxide (1 eq) | lithium chromate hydrate (1 eq) | lead(II) chromate (1 eq) | cesium chromate (1 eq) | barium chromate (1 eq)