Collier's New Encyclopedia (1921)/Scheelite

SCHEELITE, native calcium tungstate, CaWO$4$, 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 &ldquo;heavy stone.&rdquo; 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.