A.sardonyx, Philem.216, Gal.5.46, AP1.116, J.AJ3.7.5, BJ5.5.7, Apoc.21.20, Ps.-Plu.Fluv.20.4, etc. The stone was called ὄνυξ when the dark ground was simply spotted or streaked with white, but σαρδόνυξ if the different colours were disposed in layers.
σαρδόνυξ , υ^χος, ὁ, (σάρδιον)