Explanation
Columnite tantalite complex chain structured oxide minerals. The chemical formula is (Fe. Mn) (NI>, TaM),; "Fe and Mn, Nl) and Ta are completely isomorphic, respectively. The crystal is granular, massive, radial, and cluster shaped. The crystal surface is smooth, sometimes with longitudinal lines. The crystal plane is sometimes rough like coke, iron black to brown black, and stripes are dark red to black,
Classification
Natural materials and products -> Mineral materials