a tungstate of iron and manganese the chief ore of tungsten
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wolframitea tungstate of iron and manganese, the chief ore of tungsten
wolframitesWOLFRAMITE, a tungstate of iron and manganese, the chief ore of tungsten
wolframiteA black or brown mineral that is the chief ore of tungsten. It consists of a tungstate of iron and manganese
columbitesA black mineral, typically occurring as dense, tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium
columbiteA black mineral, typically occurring as dense, tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium
wolframsmineral, iron manganese tungstate, (Fe,Mn)WO4, occurring in heavy grayish-black to brownish-black tabular or bladed crystals: an important ore of tungsten
wolframmineral, iron manganese tungstate, (Fe,Mn)WO4, occurring in heavy grayish-black to brownish-black tabular or bladed crystals: an important ore of tungsten