Black onyx
- What it is
- A banded form of chalcedony (microcrystalline quartz). Solid black onyx is usually colour-enhanced, a long-standing trade practice. Mohs hardness about 7.
- Where it comes from
- Sources include India, Brazil and Uruguay, among many others.
- In tradition
- In modern crystal lore it is traditionally associated with protection, strength and self-control.















