WordWeight : Weighing the Words

Pronunciation : Chal*ced"o*ny
Part of Speech : n.;
Etymology : [ L. chalcedonius, fr. Gr. calc?doine, OE. calcidoine, casidoyne. Cf. Cassidony.] (Min.)
Definition : Defn: A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax. [Written also calcedony.]

Note: When chalcedony is variegated with with spots or figures, or arranged in differently colored layers, it is called agate; and if by reason of the thickness, color, and arrangement of the layers it is suitable for being carved into cameos, it is called onyx. Chrysoprase is green chalcedony; carnelian, a flesh red, and sard, a brownish red variety.

pl. Chalcedonies.
Source : Webster's Unabridged Dictionary, 1913