Library / English Dictionary

    CALCEDONY

    Pronunciation (US): Play  (GB): Play

     I. (noun) 

    Sense 1

    Meaning:

    A milky or greyish translucent to transparent quartzplay

    Synonyms:

    calcedony; chalcedony

    Classified under:

    Nouns denoting substances

    Hypernyms ("calcedony" is a kind 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)

    Hyponyms (each of the following is a kind of "calcedony"):

    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)

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