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.
Vrsta prugastog kalcedona, sastoji se od jednog crnog i jednog sjajnog sloja (upotrebljava se za izradu nakita); med. nagomilavanje gnoja između pločica rožnjače. (grč.)