from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rare, highly radioactive yttrium thorium sorosilicate mineral with conchoidal fracture.

from The Century Dictionary and Cyclopedia

  • n. A silicate of thorium and the yttrium earths, occurring in massive forms of a dark olive-green color. It is found with gadolinite and other rare species in Llano county, Texas.


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