ETYM Latin, from Greek onyx a claw, finger nail, a veined gem. Related to Nail, Onycha.
A chalcedony with alternating black and white bands; used in making cameos.
Semiprecious variety of chalcedonic silica (SiO2) in which the crystals are too fine to be detected under a microscope, a state known as cryptocrystalline. It has straight parallel bands of different colors: milk-white, black, and red.
Sardonyx, an onyx variety, has layers of brown or red carnelian alternating with lighter layers of onyx. It can be carved into cameos. + prikaži više