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Magnetite distribution area and chemical composition

Magnetite is widely distributed and has many causes. Born in metamorphic deposits and endogenous deposits, magmatic origin deposits are typical of Sweden's Kiruna; the minerals associated with NdFeB volcanism are formed directly from the Chilean Laike iron ore; exposure to metamorphic formed iron ore is in Daye, China. Iron ore is typical; Iron ore formed by regional metamorphism of iron-bearing sedimentary rock formations is of low grade, and Russia, North America, Brazil, Australia, and Anshan, Liaoning Province, China all have a large number of outputs. Magnetite is the main mineral raw material for ironmaking and it is also a traditional Chinese herbal medicine.
The chemical composition of magnetite is Fe3O4, and the crystal is an equiaxed oxide mineral. Neodymium-Iron-boron crystals are often octahedral and rhombic dodecahedron, and aggregates are granular or massive. When an intact single crystal is in the form of an octahedron or a rhombic dodecahedron and is in the shape of a rhombic dodecahedron, the diamond surface often has a stripe parallel to the diagonal of the crystal surface. The aggregates are dense blocks or grains. The color is iron black, the streak is black, the neodymium iron boron metallic luster or semi-metallic luster, opaque, no cleavage, Mohs hardness 5.5-6, specific gravity 4.8-5.3. Because of its strong magnetic properties, ancient Chinese ancient Chinese books were called magnets, and they were characterized by magnetic properties. In addition, there were names such as cadmium stone, magnetite, and dark stone. The iron content is 72.4%, which is the most important iron ore. If the ore contains few harmful elements, it can be directly used in open hearth steelmaking. Many magnetite are also accompanied by titanium, vanadium, chromium and other elements, which can be comprehensively utilized in the smelting process. Magnetite is also one of the traditional Chinese medicines. Traditional Chinese medicine has the effect of calming the nerves.
Magnetite black. Streaks black. Half-metallic to metallic luster. opaque. Without cleavage, sometimes ∥{111} cracking is observed, which is often due to the orientation of the inclusions of titanium ferrite and titanomagnetite in the titanium-bearing magnetite in the {111} direction. Brittle. Hardness 5.5~6. The relative density is 4.9~5.2. With strong magnetic, NdFeB Curie point (Tc) 578 °C. The Curie point is a thermomagnetic effect of magnetic minerals, which is the critical temperature for the transformation of magnetic or diamagnetic materials into paramagnetic materials by heating.

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