Found 16 Onyx CC0 textures in library

Crystal Brown Onyx
Dark Brown Onyx
Golden Onyx 1
Grey Stariato Onyx
Ivory Grey Onyx
Ivory Vein Cut Onyx
Onice Cristallino Onyx
Onice Girasole Onyx
Onice Mielle Bolla Onyx
Orange Wave Onyx
Red Onyx
Red Onyx 2
Red Onyx 3
Salmon Onyx
Spider Onyx
Starlicia Onyx