Tantalum does not occur free in Nature, but always associated to oxygen and other elements. The main tantalum ore is tantalite, being also possible to find this element in smaller amounts in samarskite, pyrochlore, fergusonite and euxenite. The main tantalite deposits are located in Africa (Rhodesia, Congo, Nigeria and Mozambique) and in Brazil. Also in Portugal and in Australia smaller deposits of this ore exist.