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Columbite Tantalite Metal

Tantalite is purchased and sold solely on its ta2o5 contentb2o5 content is not figured into the payable value for tantalitef the material contains a minimum amount of 50 nb2o5 with a small percentage of ta2o5 it would be traded as columbiteolumbite is purchased and sold on the nb2o5 ta2o5 content, known as combined pentoxide cpo.