Answer: wolfram

AnswerCrossword Clue
WOLFRAMImportant ore of tungsten.
wolframtungsten (a metallic element)
wolframngsten
wolframrare, metallic element having a bright-gray color, a metallic luster, and a high melting point, 3410┬░ C, and found in wolframite, tungstite, and other minerals: used in alloys of high-speed cutting tools, electric-lamp filaments, etc. Symbol: W;
wolframmineral, iron manganese tungstate, (Fe,Mn)WO4, occurring in heavy grayish-black to brownish-black tabular or bladed crystals: an important ore of tungsten
wolframwolframite