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Tungsten is found in several ores, but only two kinds of tungsten bearing mineral rocks, called . for electric filaments and armor piercing ammunition, as well as hard tungsten carbide machine tools. . Tungsten: resource and production.
Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. It is an important . hand held (direct vision) spectroscope, may also be of use: most natural stones show a number of faint absorption lines in the yellow region of the.