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Chemically related to vanadium are the two elements tantalum and columbium or niobium.
Columbium is a metal closely resembling tantalum and tantalum found a use as electric light filaments.Creative Chemistry|Edwin E. Slosson
Columbium was discovered in a mineral sent from Massachusetts in North America.The Mosaic History of the Creation of the World|Thomas Wood
Columbium pentoxide (columbic acid), Cb2O5, is obtained from columbite, after the removal of tantalum (see above).
Columbium pentafluoride, CbF5, is obtained when the pentoxide is dissolved in hydrofluoric acid.