SCHEELITE, native calcium tungstate, CaWO₄, an important ore of tungsten. Occurs as a pale-colored, stony looking mineral. Owing to its unusual heaviness it was given the name tungsten by the Swedes, meaning “heavy stone.” The name was later used to describe the metal when it was discovered in 1781 by K. W. Scheele, while the ore itself was given the name scheelerz or scheelite.