Definitions

from The Century Dictionary.

  • noun A fluocarbonate of cerium, lanthanum, and didymium from the Bastnäs mine, Sweden. It also occurs as an alteration product of tysonite near Pike's Peak, Colorado.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A light brown mineral that is a source of many rare earth elements

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a yellow-to-brown mineral that is a source of rare earth elements

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