Chalcedon

Definitions of Chalcedon
  1. noun
    a milky or greyish translucent to transparent quartz
    synonyms: Chalzedon, Milchquarz
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    types:
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    Achat
    an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
    Blutstein
    green chalcedony with red spots that resemble blood
    Karneol
    a translucent red or orange variety of chalcedony
    Onyx
    a chalcedony with alternating black and white bands; used in making cameos
    Sarder
    a deep orange-red variety of chalcedony
    Moosachat
    an agate resembling moss with brown, black, or green markings
    type of:
    Quarz
    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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