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columbite
columbite definition
co·lum·bite (kə lum′bīt′)
noun
a black, orthorhombic mineral, (Fe,Mn)(Nb,Ta)O, that is an ore of niobium and tantalum
Etymology: columb(ium) + -ite
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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