Autunite

ahd-5
  • noun. A yellowish, fluorescent minor ore of uranium with the composition Ca(UO2)2(PO4)2·10–12H2O.
    • The Century Dictionary and Cyclopedia
  • noun. A native hydrous phosphate of uranium and calcium, occurring in tabular crystals, nearly square in form, and of a citron or sulphur-yellow color.
    • the GNU version of the Collaborative International Dictionary of English
  • noun. A lemon-yellow phosphate of uranium and calcium occurring in tabular crystals with basal cleavage, and in micalike scales. H., 2-2.5. Sp. gr., 3.05-3.19.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. A yellow mineral with tetragonal crystals, Ca(UO2)2(PO4)2·10-12H2O.
    • Word Usage
    "But an unexpected fact was noted: certain minerals (pitchblende, chalcolite, autunite) had a greater activity than might be expected on the basis of their uranium or thorium content."
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