σαρδόνυξ,ῠχος,ὁ, (σάρδιον)
A. sardonyx, Philem. 216 , Gal. 5.46 , AP 1.116 , J. AJ 3.7.5 , BJ 5.5.7 , Apoc. 21.20 , Ps.- Plu. Fluv. 20.4 , etc. The stone was calledὄνυξwhen the dark ground was simply spotted or streaked with white, butσαρδόνυξif the different colours were disposed in layers.