calcedonia

Definitions of calcedonia
  1. noun
    a milky or greyish translucent to transparent quartz
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    ágata
    an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
    heliotropo, restañasangre, sanguinaria, sanguinario
    green chalcedony with red spots that resemble blood
    cornalina, cornerina
    a translucent red or orange variety of chalcedony
    ónice, ónix
    a chalcedony with alternating black and white bands; used in making cameos
    plasma
    a green slightly translucent variety of chalcedony used as a gemstone
    type of:
    cuarzo
    a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
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