a rare-earth mineral, fluorocarbonate of lanthanum and cerium, with a waxy-yellow to reddish-brown color, commonly associated with zinc ores.
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British Dictionary definitions for bastnaesite
a rare yellow to reddish-brown mineral consisting of a carbonate of fluorine and several lanthanide metals. It occurs in association with zinc and is a source of the lanthanides. Formula: LaFCO 3
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