
Energy and Environmental Profile of the Mining Industry 4
The most important iron oreforming minerals are: • Magnetite Magnetite (Fe3O4) forms magnetic black iron ore. There are large deposits of magnetite in Russia and Sweden. • Hematite Hematite (Fe2O3) is a red iron ore. Hematite occurs in almost all forms, from solid rock to loose earth. It is the most plentiful iron ore and occurs in ...