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coltan

noun
  1. a metallic ore found esp in the E Congo, consisting of columbite and tantalite (a source of the element tantalum)
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Word Origin

C20: from columbite + tantalite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012