Informations About Tungsten
【Chinatungsten Online News Net- Tungsten News】
Tungsten occurs principally in the minerals SCHEELITE, wolframite, huebnerite, and ferberite. In the United States these minerals occur most notably in California and Colorado. Elsewhere they are found in China, the Buryat republic of Russia, Kazakhstan, South Korea, Bolivia, and Portugal. The metal is obtained commercially by the reduction of tungstic oxide with hydrogen or carbon. The pure metal is steel gray to tin white in color. Its physical properties include the highest melting point of all metals, 3,410 deg C (6,170 deg F), a boiling point of 5,660 deg C (10,220 deg F), and a density of 19.3 g/cu cm.
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