Definitions

from The Century Dictionary and Cyclopedia

  • n. A hydrated uranate of thorium, yttrium, and lead, occurring in massive forms with a velvet-black color and high specific gravity. It is found in Llano county, Texas, associated with gadolinito, fergusonite, and other rare species.
  • n. Like other varieties of uraninite, this mineral exhibits marked radioactivity.

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