chal·ce·do·ny /kælˈsɛdṇi, ʧæl; ˈkælsəˌdoni, ˈʧæl, ˌdɑ-/
Chal·ced·o·ny n.; pl. Chalcedonies Min. 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.
n : a milky or grayish translucent to transparent quartz [syn: calcedony]
Mentioned only in Rev. 21:19, as one of the precious stones in
the foundation of the New Jerusalem. The name of this stone is
derived from Chalcedon, where it is said to have been first
discovered. In modern mineralogy this is the name of an
agate-like quartz of a bluish colour. Pliny so names the Indian
ruby. The mineral intended in Revelation is probably the Hebrew
_nophekh_, translated "emerald" (Ex. 28:18; 39:11; Ezek. 27:16;
28:13). It is rendered "anthrax" in the LXX., and "carbunculus"
in the Vulgate. (See CARBUNCLE.)