The main component of magnetite is Fe3O4.

Magnetite has strong magnetism, black stripes and semi-metallic luster. It belongs to the equiaxed crystal system, and the crystal is rhombic dodecahedron or octahedron. Magnetite is mainly distributed in Shandong, Henan, Hebei, Liaoning, Heilongjiang and Inner Mongolia, and is widely distributed on the earth. According to the different causes, there are several representative types. Kiruna magnetite in Sweden is of magmatic origin, Laike iron mine in Chile is formed by magma left by volcanic eruption, and Daye iron mine in China is formed by contact metamorphism.

Magnetite is the main raw material in the ironmaking process, and the main gangue components are timely and silicate, usually with high sulfur and phosphorus content and poor reducibility. Magnetite has strong magnetism, can be attracted by magnets for a long time, and can be used to make compasses.

What are the main components of hematite and magnetite?

Iron oxide, the main component of hematite; The main component of magnetite is ferroferric oxide.

So the answer is: iron oxide; Ferroferric oxide.

Magnetite chemical formula

The composition of the magnet is ferroferric oxide, also called iron oxide black. Chemical formula: Fe3o4, molecular weight 23 1.54, inverse spinel, cubic system, black solid powder, density 5. 18g/cm 3, melting point 1594.5℃.

Iron wire burns in oxygen to generate ferroferric oxide; When iron is heated to 500℃ in the air, iron reacts with oxygen in the air to produce ferroferric oxide; The blue-gray debris scattered around the anvil is mainly ferroferric oxide.

Iron reacts with high temperature steam to generate ferroferric oxide and hydrogen; The main component of natural magnetite is ferroferric oxide crystal. Ferroferric oxide is an important common iron compound.

Magnets in the market are mostly complex mixtures of metal salts, and the main components are barium salts, iron salts, ferrite salts, cobalt and nickel and other elements and substances.

Extended data:

Magnets can be divided into "permanent magnets" and "non-permanent magnets". Permanent magnets can be natural products, also known as natural magnets, or artificial. Non-permanent magnets are magnetic only under certain conditions, usually in the form of electromagnets, that is, using current to strengthen their magnetic fields.

Before deciding which kind of magnet to choose, it is necessary to know what role the magnet needs to play, mainly: moving objects, fixing objects or lifting objects.

Some substances can be rubbed into magnets, and the materials are either iron or steel, but not all steel can be made into magnets, because it contains substances, and stainless steel cannot be made into magnets.

What is magnetite?

Magnetite is a kind of ore in the earth's crust, which is formed by geological changes or volcanic eruption, and belongs to oxide magnetite. Magnetite is mainly composed of Fe3O4, which contains iron, which is one of the most abundant elements in the crust.

This ore is widely distributed in Shandong, Hebei, Henan, Liaoning, Heilongjiang, Inner Mongolia, Hubei, Yunnan, Guangdong, Sichuan, Shanxi, Jiangsu, Anhui and Anshan, Liaoning. Magnetite, also known as dark stone and magnet, was discovered in early ancient China! Then it was used in Chinese medicine! Magnetite is very magnetic, the strongest of all minerals, and can be attracted by permanent magnets. Sina, one of four great inventions of ancient china, is made of this feature.

At present, the soft magnetism in magnets is produced by magnetite powder and rubber. Magnetite powder, also called magnetic powder, is a kind of powdered magnetite! Have weak magnetism. It has alkali resistance, acid resistance and radiation resistance. Soft magnetic is easy to demagnetize and magnetize. Do not be widely used in furniture decoration, electrical equipment and electronic equipment.

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Main components of limonite

Earlier, limonite was thought to be an independent mineral with a composition of 2Fe2O3 3H2O, but X-ray diffraction analysis showed that it was mostly aphanitic goethite, which could be mixed with lepidolite, hematite, Yingshi and clay. , containing adsorbed water and capillary water, the composition is variable, but it is basically FeO nH2O. Physical properties are also variable, but they are always brown in various shades and yellowish brown in stripes.

Because it belongs to the weathering product of iron-bearing minerals, its composition is impure and its water content changes greatly. Usually yellow-brown to brown-black, with yellow-brown stripes, semi-metallic luster, massive, stalactite-like, grape-like, loose, porous or powdery, often presenting the illusion of nodular or pyrite crystal form. Hardness varies with mineral morphology and is non-magnetic. Limonite is a very common secondary substance under oxidation conditions, and a red "iron cap" is often formed in the oxidation zone of sulfide deposits, which can be used as a prospecting indicator.