Magnetite

Magnetite is a mineral, one of the two common naturally occurring oxides of Iron (chemical formula Fe3O4) and a member of the spinel group. Magnetite is the most magnetic of all the naturally occurring minerals on Earth. Naturally magnetized pieces of magnetite, called lodestone, will attract small pieces of iron, and this was how ancient people first noticed the property of magnetism.

Small grains of magnetite occur in almost all igneous and metamorphic rocks. It is black or brownish-black with a metallic luster, has a Mohs hardness of 5–6 and a black streak.

The chemical IUPAC name is iron(II,III) oxide and the common chemical name is ferrous-ferric oxide.

Read more about Magnetite:  Properties, Distribution of Deposits, Biological Occurrences, Synthetic Magnetite, Gallery of Magnetite Mineral Specimens

Other articles related to "magnetite":

Anaerobic Corrosion - Transformation of Ferrous Hydroxide Into Magnetite
... the ferrous hydroxide (Fe(OH)2 ) can be oxidized by the protons of water to form magnetite and molecular hydrogen. 3 Fe(OH)2 → Fe3O4 + H2 + 2 H2O ferrous hydroxide → magnetite + hydrogen + water The well crystallized magnetite (Fe3O4) is thermodynamically more stable than the ferrous ...
Lunae Palus Quadrangle - Results From Viking I Mission - Analysis of Soil
5% carbonate (calcite), and about 5% iron oxides (hematite, magnetite, goethite?) ... The magnetic chemicals could be magnetite and maghemite ... the Mars Spirit Rover (landed in 2004) indicated that magnetite could explain the magnetic nature of the dust and soil on Mars ...
Maghemite - Occurrence
... oxidation of spinels containing iron(II) such as magnetite or titanian magnetite ... It is associated with magnetite, ilmenite, anatase, pyrite, marcasite, lepidocrocite and goethite ... The name alludes to somewhat intermediate character between MAGnetite and HEMatite ...
Mars Pathfinder - Results From Pathfinder
... that the airborne dust did not contain pure magnetite or just one type of maghemite ... Using much more sophisticated instruments, Mars Spirit Rover found that magnetite could explain the magnetic nature of the dust and soil on Mars ... Magnetite was found in the soil and that the most magnetic part of the soil was dark ...
Gallery of Magnetite Mineral Specimens
... Octahedral crystals of magnetite up to 1.8 cm across, on cream colored Feldspar crystals ... Size 8.4 x 5.2 x 3.2 cm Unusual octahedral magnetite chalcopyrite association, Aggeneys, Northern Cape Province, South Africa ... Size 7 x 6 x 4 cm Red gem-like crystals of Chondrodite with magnetite, Tilly Foster mine, Brewster, New York USA ...