magnétite - translation to french
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magnétite - translation to french

IRON ORE MINERAL
Triiron tetraoxide; Magnetene; Magnetite nanoparticle
  • Magnetite and other heavy minerals (dark) in a quartz [[beach]] [[sand]] ([[Chennai]], [[India]]).
  • Unit cell of magnetite. The gray spheres are oxygen, green are divalent iron, blue are trivalent iron. Also shown are an iron atom in an octahedral space (light blue) and another in a tetrahedral space (gray).
  • Magnetite magnetosomes in Gammaproteobacteria

magnétite         
n. magnetite, black iron oxide mineral that is an important ore of iron

Definition

magnetite
['magn?t??t]
¦ noun a grey-black magnetic mineral which consists of an oxide of iron and is an important form of iron ore.

Wikipedia

Magnetite

Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe2+Fe3+2O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. With the exception of extremely rare native iron deposits, it 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, which is how ancient peoples first discovered the property of magnetism.

Magnetite is black or brownish-black with a metallic luster, has a Mohs hardness of 5–6 and leaves a black streak. Small grains of magnetite are very common in igneous and metamorphic rocks.

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

Examples of use of magnétite
1. Quant aux 17 sites destinés ŕ l‘exploration, ils s‘étendent sur une superficie de 121.832 ha et concernent l‘or, le fer, la magnétite, le plomb, la barytine, le zinc, le cuivre, le wolfram et l‘étain.
2. Ils sont répartis sur onze wilayas: Tamanrasset (or, wolfram et étain), Skikda (fer, magnétite, plomb, zinc et cuivre), Batna (plomb et barytine), Sétif (plomb et zinc), Bouira (plomb et zinc), Médéa (plomb et zinc), Nâama (plomb et zinc), Tébessa (plomb et zinc), Souk Ahras (plomb et zinc), Annaba (wolfram) et Illizi (wolfram et étain). Quant ŕ la date d‘ouverture des plis, elle a été fixée au 11 novembre pour les offres techniques et au 21 décembre pour les offres financi';res.