铌铁矿 nítiěkuàng columbite Definitions Defs Origin Strokes Stroke Words Sentences Sents 铌铁矿 鈮鐵礦 nítiěkuàng columbite columbite; a black mineral that is an ore of niobium and tantalum Cross-References Classifier 座 zuò
铌铁矿 鈮鐵礦 nítiěkuàng columbite columbite; a black mineral that is an ore of niobium and tantalum Cross-References Classifier 座 zuò
