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Molecular formula : MW : CAS :
nature : (Fe, Mn) (Nb, Ta) 2O6, formerly known as coltan iron ore. Nb2O5 with 78.9%. With the formation of tantalite categories like quality with the series. Rhomboidal. Crystal was short columnar or plate; Appearing granular assemblies. Rail black or dark brown. The latest project traces of dark-red to brown. Semi-metallic sheen. Hardness 6. Fracture times vary from desert to. Density 5.2 ~ 6.25. Produced in the granite and granitic pegmatite, often with beryl, tourmaline, etc. symbiotic. The extraction of niobium and tantalum or prepared niobium, tantalum oxide main raw material.
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