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Definition of chalcedony : A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.

Synonyms:

calcedony

emerald, onyx, star sapphire, ruby, turquoise, diamond, bloodstone, lapis lazuli, sardonyx, agate, topaz, gem, moonstone, garnet, aquamarine, opal, carbuncle, sapphire, jade, coral, hyacinth, zircon, beryl, amethyst, rose quartz

diatomite, corundum, pyrite, mineral, brookite, cryolite, lime, feldspar, cobalt, crystal, asbestos, pumice, fool's gold, spar, rhodonite, quicklime, ozocerite, lignite, glauconite, alabaster, manganese, coal, quartz, silica, azurite, molybdenite, barite, gypsum, silicate, pitchblende, clay, orthoclase, obsidian, coke, fluorite, salt, chlorite, lazurite, hornblende, selenite, sulfur, aragonite, bauxite, pyroxene, fluorspar, carbon, talcum, kaolinite, iolite, calcite, chromite, peat, mica, brimstone, magnesite, vermiculite, graphite, emery, boron

Usage examples:

• These plains are much higher than the sandstone ravines, and the soil contains not only pebbles, but angular fragments of the knots and fibres of wood in a silicified state, and much encrusted with chalcedony. - "Journal of an Expedition into the Interior of Tropical Australia In Search of a Route from Sydney to the Gulf of Carpentaria (1848) by Lt. Col. Sir Thomas Livingstone Mitchell Kt. D.C.L. (1792-1855) Surveyor-General of New South Wales", Thomas Mitchell.
• The numerous rents alluded to are not empty, but filled with chalcedony and quartz. - "The Student's Elements of Geology", Sir Charles Lyell.
• Many rich and valuable objects are mentioned in her catalogue: Statuettes, gold and silver caskets and mirrors, crystal, chalcedony and jasper goblets and vases, carved ivories, amber, corals, and curiously wrought chessmen, beautiful fans, medallions, clocks of rare workmanship which struck the hours and half- hours, magnificent plate, sometimes inlaid with precious stones, glass and pottery, suits of armour, ivory hunting horns, and various relics of the chase. - "The First Governess of the Netherlands, Margaret of Austria", Eleanor E. Tremayne.