an oxide of manganese occurring in brilliant steel gray or iron black crystals
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AnswerCrossword Clue
manganitean oxide of manganese, occurring in brilliant steel-gray or iron-black crystals
manganitesMANGANITE, an oxide of manganese, occurring in brilliant steel-gray or iron-black crystals
hematitevery common mineral, iron oxide, Fe2O3, occurring in steel-gray to black crystals and in red earthy masses: the principal ore of iron
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
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