Crookesite

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Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. A tetragonal-disphenoidal mineral containing copper, selenium, silver, and thallium.
    • The Century Dictionary and Cyclopedia
  • n. A rare metallic mineral consisting of the selenids of copper, thallium, and silver.
    • Word Usage
    "It forms a small number of rare minerals, including crookesite and lorandite."
     
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