Columbite and galena
Crossword Clue

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AnswerCrossword Clue
ORESColumbite and galena
ORESColumbite and cuprite
ORESBauxite and columbite, e.g.
coltana metallic ore of columbite and tantalite, found in the Congo
columbitesCOLUMBITE, a mineral, niobate and tantalate of iron and manganese, aka niobite
coltansCOLTAN, a metallic ore of columbite and tantalite, found in the Congo
coltana dull black ore that consists of a mixture of columbite and tantalite and is a minor source of tantalum
tantaluma gray-white ductile acid-resisting metallic element found combined in rare minerals (as tantalite and columbite) and used especially in electronic components see element table
tantalumsgray, hard, rare, metallic element occurring in columbite and tantalite and usually associated with niobium: used, because of its resistance to corrosion by most acids, for chemical, dental, and surgical instruments and apparatus. Symbol: Ta; at