chalcedony

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A cut and polished chalcedony geode.

chalcedony (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”, American Scientist, 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.)

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