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The mineral group tantalite 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. However, tantalite has a much greater specific gravity than columbite . Iron-rich tantalite is the mineral tantalite- or ferrotantalite and manganese-rich is tantalite- or manganotantalite.