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[bast-nuh-sahyt] /ˈbæst nəˌsaɪt/
a rare-earth mineral, fluorocarbonate of lanthanum and cerium, with a waxy-yellow to reddish-brown color, commonly associated with zinc ores.
Also, bastnäsite.
Origin of bastnaesite
named after Bastnäs, mine in Sweden; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for bastnaesite
  • Recoverable concentrations can be found in several minerals, such as bastnaesite and monazite.
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: LaFCO3
Word Origin
C19: from Swedish bastnäsit, after Bastnäs, Sweden, where it was found
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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