from The Century Dictionary.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A rare, highly
radioactive yttrium thorium sorosilicate mineralwith conchoidal fracture.
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