chalcedon

Definitions of chalcedon
  1. noun
    a milky or greyish translucent to transparent quartz
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    types:
    agaat
    an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
    heliotroop
    green chalcedony with red spots that resemble blood
    kornalijn
    a translucent red or orange variety of chalcedony
    type of:
    kwarts
    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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