calcedony

Definitions of calcedony
  1. noun
    a milky or greyish translucent to transparent quartz
    synonyms: chalcedony
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    types:
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    agate
    an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
    bloodstone, heliotrope
    green chalcedony with red spots that resemble blood
    carnelian, cornelian
    a translucent red or orange variety of chalcedony
    chrysoprase
    a green variety of chalcedony valued as a gemstone
    onyx
    a chalcedony with alternating black and white bands; used in making cameos
    plasma
    a green slightly translucent variety of chalcedony used as a gemstone
    sard, sardine, sardius
    a deep orange-red variety of chalcedony
    moss agate
    an agate resembling moss with brown, black, or green markings
    sardonyx
    an onyx characterized by parallel layers of sard and a different colored mineral
    type of:
    quartz
    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
    transparent gem
    a gemstone having the property of transmitting light without serious diffusion
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