iron manganese tungsten

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a mineral consisting of iron and manganese tungstate in crystalline form;
the principal ore of tungsten;
found in quartz veins associated with granitic rocks
• Syn:
wolframite
• Hypernyms:
mineral
• Substance Meronyms:
tungsten, wolfram, W, atomic number 74