Columbite Tantalite 3 - bistro-festival.it
'Coltan' is the abbreviated name for 'columbite–tantalite', a group of dense, black metallic ores that contain both niobium minerals (columbite) and tantalum minerals (tantalite) in varying proportions. Columbite is named after niobium's historical name, columbium. Industry participants often just call this mineral 'tantalite' because the ...
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