Black iron ore, iron oxide (Fe3O4). Widely distributed, magnetite is found in nearly all igneous and metamorphic rocks. It is strongly magnetic and some deposits, called lodestone, are permanently magnetized. Lodestone has been used as a compass since the first millennium BC.
An oxide of iron that is strongly attracted by magnets; SYN. magnetic iron-ore.
Gvozdena ruda (Fe3 O4) na kojoj je prvo primećeno magnetno svojstvo privlačenja, magnetovac (grč.)
Magnetit.