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Tungsten oxide (W2O3) is a compound of tungsten and oxygen (See Uncle Tungsten by Oliver Sacks).
Tungsten Trioxide, also known as tungsten oxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten.
Tungsten carbide powder is the main raw material for the production of tungsten carbide, chemical formula WC.
Tungsten belongs to the rare element in the earth's crust containing only 0.007% of China's tungsten reserves of about 55% of the world's total reserves in the first place.