Onyx is a mineral, like marble, granite or quartzite.
It is part of the quartz mineral group and is a layered stone.
Some of its layers may contrast.
In correct usage, the name refers to a (usually) black and white banded variety of Agate, or sometimes a monochromatic agate with dark and light parallel bands (brown and white for example) - but traditionally the name was reserved for black and white banded agate, and brown varieties named Sardonyx.
Onyx has a Mohs scale hardness reading of 6.5 to 7, and it possesses a smooth, wax-like luster.
It is often used as the background of a cameo broach, pendant or ring.


Onyx gives strength.
It promotes vigor, steadfastness and stamina.
Imparts self-confidence, helping you to be at ease in your surroundings.
Onyx banishes grief, enhances self-control and stimulates the power of wise decision-making.
It encourages happiness and good fortune.

Healing crystal meanings are spiritual supports to healing, not prescription or healthcare information.