The tantalum-dominant members (iron or manganese specific) of the Columbite-Tantalite series. These are black, dense minerals used as ores of tantalum. They are strong grounding stones promoting focus, determination, and repelling negativity.
Iron-Black, Brownish-Black, Reddish-Brown, often with a submetallic luster
Tantalite is classified as a oxide minerals mineral which typically crystallizes in the orthorhombic system. Its chemical formula is (Fe,Mn)Ta2O6.