A special property of pyrrhotite is that it is a natural MAGNET that attracts iron.

So your answer is: MAGNET

Mohammad Kolahdoozan has written:

'Adsorption and flotation characteristics of hexagonal and monoclinic pyrrhotite' -- subject(s): Pyrrhotite, Flotation

Yes, although only weakly. It will move a compass needle or attract a magnet. This property is useful for distinguishing pyrrhotite from other brassy colored sulphide minerals.

Marinus Jacobus Dekkers has written:

'Some rockmagnetic parameters for natural goethite, pyrrhotite, and fine-grained hematite' -- subject(s): Goethite, Hematite, Magnetic properties, Paleomagnetism, Pyrrhotite

Hematite

Magnetite

Lodestone

Franklinite

Chromite

Ilmenite

Pyrrhotite