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From: Webster's Revised Unabridged Dictionary (1913)

 Tung·sten n.
 1. Chem. A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18.
 2. Min. Scheelite, or calcium tungstate. [Obs.]
 Tungsten ocher, or Tungstic ocher Min., tungstite.
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