Tungsten is named from the Swedish tung sten, heavy stone; also known as wolfram (from wolframite, said to be named from wolf rahm or spumi lupi (Latin), because the ore interfered with the smelting of tin and was supposed to devour the tin). Tungsten was first isolated in 1783. Tungsten occurs in wolframite, huebnerite and ferberite. Important deposits of tungsten occur in California, Colorado, South Korea, Bolivia, Russia and China. China is reported to have about 75% of the world's tungsten resources. The metal is obtained commercially by reducing tungsten oxide with hydrogen or carbon. Pure tungsten is a steel-gray to tin-white metal. Tungsten has the highest melting point and lowest vapor pressure of all metals. Tungsten and its alloys are used extensively in for filaments for electric lamps, electron and television tubes and for metal evaporation work. Tungsten carbide is of great importance to the metal working, mining and petroleum industries.