Mineralogy of Tin and NiobiumTantalumBearing Minerals in ...
In general columbitetantalite in Thailand contains higher Ta than Nb, and tends to be high in Fe in the north, whereas in the south, Mn is predominant. In Malaysia, columbite as well as ferrocolumbite is more common than tantalite. In the southern part (Bakri) Mntantalite with Tarich series such as wodginite and tapiolite are also observed.