Noun
An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron.
Source: Webster's dictionaryIt has a spinel -like structure similar to magnetite but uses one quadravalent and two divalent cations M 2 +2 M +4 O 4 instead of two trivalent and one divalent cations. Source: Internet
An example is magnetite (Fe 3 O 4 ), which contains Fe 2+ and Fe 3+ ions with different magnetic moments. Source: Internet
In industrial practice, the iron catalyst is obtained from finely ground iron powder, which is usually obtained by reduction of high purity magnetite (Fe 3 O 4 ). Source: Internet
In rhyolites and trachytes, early crystals of hornblende and biotite may be found in great numbers partially converted into augite and magnetite. Source: Internet
It has since been shown that similar magnetite structures can form without the presence of microbial life in hydrothermal systems. citation A few meteorites were found in Antarctica between 1912 and 1964. Source: Internet
Modern ammonia-producing plants depend on industrial hydrogen production to react with atmospheric nitrogen using a magnetite catalyst or over a promoted Fe catalyst under high pressure (convert) and temperature (450 °C) to form anhydrous liquid ammonia. Source: Internet