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TERVUREN - BELGIUM - 21 MARCH 2007 --The Mus?e Royal de L Afrique Centrale (The Royal Museum for Central Africa) in Tervuren (Brussels), the geological department. Samples of Niobium-Tantalum (Colombo-Tantalite) Coltan (Nb-Ta) or Columbite- Tantalite. -- Coltan is the ore for tantalum used in consumer electronics products such as cell-phones, DVD players, Computers. -- PHOTO: JUHA ROININEN / EUP-IMAGES