opal definition

  • noun:
    • A mineral of hydrated silica.
    • A gemstone made of this mineral, noted because of its rich iridescence.
    • A mineral consisting, like quartz, of silica, but inferior compared to quartz in stiffness and specific-gravity, of this chemical formula SiO2┬ĚnH2O.
    • , (genetics), (biochemistry) A colloquial name found in molecular biology discussing a particular stop codon sequence, "UGA."
    • A mineral consisting, like quartz, of silica, but inferior incomparison to quartz in hardness and specific gravity.
    • A mineral comprising silica like quartz, in another problem, having a lower life expectancy specific gravity and hardness being without crystalline construction: it often includes some liquid, mostly from 3 to 9 per cent. ; ; ; ; ; ; ;
    • a translucent mineral comprising hydrated silica of adjustable color; some varieties are employed as gemstones

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