a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite
"The engineer selected tungsten, also known as wolfram, for the filament because its high melting point made it ideal for the new electric lamp."
wolframite
"The geologist identified the black mineral on the rock surface as a rare deposit of wolframite containing high concentrations of tungsten."