* Magnetite: Magnetite is the most common magnetic mineral. It is a black, iron oxide mineral that is strongly magnetic. Magnetite is found in igneous and metamorphic rocks, and it is also the main component of lodestones.

* Hematite: Hematite is a red, iron oxide mineral that is weakly magnetic. Hematite is found in igneous, sedimentary, and metamorphic rocks.

* Pyrrhotite: Pyrrhotite is a bronze-colored, iron sulfide mineral that is moderately magnetic. Pyrrhotite is found in igneous and metamorphic rocks.

* Franklinite: Franklinite is a black, iron, zinc, and manganese oxide mineral that is strongly magnetic. Franklinite is found in igneous and metamorphic rocks.

* Lodestone: Lodestone is a naturally magnetized piece of magnetite. Lodestones are found in igneous and metamorphic rocks.