Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A tetragonal-ditetragonal dipyramidal mineral containing hydrogen, oxygen, silicon, and thorium.

from The Century Dictionary and Cyclopedia

  • n. This mineral, like other native compounds of thorium and uranium, has marked radioactive properties.
  • n. A mineral occurring in massive forms of a dull yellowish-brown color, and containing silica and the oxids of uranium, thorium, and the metals of the cerium and yttrium groups.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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