Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A yellowish, fluorescent minor ore of uranium with the composition Ca(UO2)2(PO4)2·10-12H2O.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A yellow mineral with tetragonal crystals, Ca(UO2)2(PO4)2·10-12H2O.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A native hydrous phosphate of uranium and calcium, occurring in tabular crystals, nearly square in form, and of a citron or sulphur-yellow color.

Etymologies

After Autun, a city of east-central France.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • The mica does not everywhere present this coarsely crystalline appearance, but in flexures and lines of union with the quartz and orthoclase is degraded to a mica schist upon whose surfaces appear uranates of lime and copper (autunite and torbernite), and in which are inclosed garnet crystals of considerable size and beauty.

    Scientific American Supplement No. 822, October 3, 1891

  • He already knew ore -- the glossy, sub-metallic, pitchy black luster of uraninite or pitchblende; the yellows of autunite and carnotite; the variant and confusing greens of tobernite.

    First Lensman

  • The radium-bearing minerals are torbernite and autunite (hydrous copper-uranium and calcium-uranium phosphates), and are found in dark felsite dikes near their intersections with east-west gold-silver-quartz veins.

    The Economic Aspect of Geology

  • 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.

    Radium And The New Concepts In Chemistry: Nobel Lecture

  • Over 150 minerals: mica, feldspar, beryl, amethyst, rose / smokey quartz, garnet, and Uranium minerals (gummite, autunite) prized by collectors / museums.

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  • ; and as phosphate in the uranites, torbernite (hydrated phosphate of uranium and copper), and autunite (hydrated phosphate of uranium and lime).

    A Text-book of Assaying: For the Use of Those Connected with Mines.

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