from The Century Dictionary.
- noun This mineral, like other native compounds of thorium and uranium, has marked radioactive properties.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A tetragonal-ditetragonal dipyramidal
mineralcontaining hydrogen, oxygen, silicon, and thorium.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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