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Borrowing from Latin chalcedonius, probably derived from the name of the town Chalcedon in Asia Minor.


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A cut and polished chalcedony geode.

chalcedony (countable and uncountable, plural chalcedonies)

  1. A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.
    • 2012 March 1, Lee A. Groat, “Gemstones”, in American Scientist[1], volume 100, number 2, page 128:
      Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)


See also[edit]

Further reading[edit]

  • Chalcedony” in David Barthelmy, Webmineral Mineralogy Database[2], 1997–.
  • chalcedony[3], Hudson Institute of Mineralogy, accessed 29 August 2016