TANTALITE [(Fe, Mn)Ta2O6]

The mineral group tantalite [(Fe, Mn)Ta₂O₆] is the primary source of the chemical element tantalum. It is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides.

Detailed Description:

However, tantalite has a much greater specific gravity than columbite (8.0+ compared to columbite's 5.2).^[2] Iron-rich tantalite is the mineral tantalite-(Fe) or ferrotantalite and manganese-rich is tantalite-(Mn) or manganotantalite.

Tantalite is also very close to tapiolite. Those minerals have same chemical composition, but different crystal symmetry orthorhombicfor tantalite and tetragonal for tapiolite.^[3]

Tantalite is black to brown in both color and streak. Manganese-rich tantalites can be brown and translucent.

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