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Chal*ced"o*ny (kăl*sĕd"&ouptack_;*nӗ or kăl"s&euptack_;*d&ouptack_;*nӗ; 277), n.; pl. Chalcedonies (-nĭz). [ L. chalcedonius, fr. Gr. CHalkhdw`n Chalcedon, a town in Asia Minor, opposite to Byzantium: cf. calcédoine, OE. calcidoine, casidoyne. Cf. Cassidony.] (Min.) A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax. [Written also calcedony.]
&hand_; 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.