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Tungsten bronze (TB) is a typical non stoichiometric compound, usually in cubic or tetragonal crystals, insoluble in water and insoluble in all acids except hydrofluoric acid, but soluble in alkaline reagents.
Tungsten trioxide exists in the form of hydrate in nature, including mineral forms: wolfram (WO3? H2O), water tungsten oxide (WO3? 2H2O) and water tungsten oxide. These minerals are rare and very rare secondary tungsten deposits.
Tungsten carbide powder (WC) is the main raw material for producing cemented carbide, chemical formula WC. The full name is Wolfram Carbide, tungsten carbide powder is black six square crystal, has metallic luster, hardness is similar to diamond, it is a good conductor of electricity and heat.
Tungsten is a parent stone element, mainly in the form of wolframite in pegmatite and hydrothermal deposits; there are about 15 known tungsten ores, of which there are mainly two wolframite and scheelite..