Atomic resolution has been obtained on a magnetite (Fe₃O₄(001)) surface using a scanning tunnelling microscope with nonmagnetic tungsten and ferromagnetic iron tips. Selective imaging of Fe^{2 +} and Fe^{3 +} on B-sites is achieved by using the ferromagnetic Fe probe tip, reflecting the different spin configurations of the two magnetic ions. Local order in the distribution of Fe^{2 +} and Fe^{3 +} on the (001) surface is found at room temperature, well above the bulk order-disorder (Verwey) transition.