noun
also cal·ced·o·ny kalˈsed ə nē, -ni
( -es )
Etymology: Middle English calcedonie, a precious stone, from Late Latin chalcedonius, from Greek chalkēdōn
: a cryptocrystalline translucent mineral constituting a variety of quartz and commonly of a pale blue or gray color, uniform tint, and nearly waxlike luster — see agate , carnelian , chrysoprase , onyx