Chemical elements
  Tungsten
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Element Tungsten, W, Transition Metal


History

Tungsten was produced by de Elhuyar brothers, students of Bergman in 1783. They named the new metal wolfram, after the mineral wolframite in which tungsten oxide was found. Miners of 1416 centuries noticed that roasting of the ore tales the tin away, transferring it into slag. They called the ore "wolf&

Occurrence

Tungsten occurs mostly as complex oxidized compounds composed by WO3 and iron or manganese, calcium, copper, lead, thorium and, sometimes, rare earth elements oxides. Wolframite is the most abundant mineral. It is a solid solution of iron and manganese tungstates (wolframates) mFeWO4xnMnWO4 which are salts of tungstic (wolframic) acid. Tungsten ores are associated with granites. Mai deposits are located in China, Myanmar, USA, Bolivia and Portugal, as well as in Ural, Caucasus and Transbaikalia regions of Russia.

Large wolframite and scheelite crystals are very rare. Usually they are found only as inclusions in granites with the average tungsten concentration around 1...2%.

Neighbours



Chemical Elements

41Nb
92.9
Niobium
42Mo
95.9
Molybdenum
43Tc
98.9
Technetium
73Ta
180.9
Tantalum
74W
183.8
Tungsten
75Re
186.2
Rhenium
105Db
[260.0]
Dubnium
106Sg
[263.0]
Seaborgium
107Bh
[262.0]
Bohrium

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