a dark green
to black, hard, radioactive
mineral, beryllium iron yttrium silicate, Be2FeY2Si2
, that is an ore
of various rare-earth elements
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'gadolinite'Ger gadolinit, after J. Gadolin (1760-1852), Finn chemist who isolated it