magnetite series

The magnetite series refers to a group of isomorphous minerals within the spinel group. The chief member of this series is magnetite, an iron oxide with the chemical formula Fe₃O₄. These minerals are typically black with a metallic luster and are found in igneous and metamorphic rocks, as well as in meteorites. Other minerals in the magnetite series include magnesioferrite, franklinite, jacobsite, trevorite, and maghemite. All minerals in this series exhibit magnetic properties, though some, like franklinite and jacobsite, are only weakly magnetic. Magnetite itself has been known for its magnetic properties since ancient times.12