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The chemistries of the tungstate ion (WO4)2-, and the molybdate ion (MoO4)2-, are so similar that the groups of minerals are always associated, with extensive solid solution between the two extremes. The anions are distorted tetrahedra with the central tungsten or molybdenum atom bonded to four oxygen atoms by largely covalent bonds.

Tungstates are very important industrial minerals giving rise to tungsten metal which when alloyed with iron, produces a very strong corrosion resistant steel. The metal is also extensively used in the manufacture of filaments for light-bulbs, vacuum and x-ray tubes.


 
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