Black Onyx is rare, the black Onyx that we mostly buy and experience is Onyx with white and sometimes brown edges and stripes. Black Onyx is a Chalcedony species.
The black Onyx is a powerful energy calming energy in stressful situations. Black Onyx supports you to speak your truth and emotions from your heart. It has a supportive positive effect on the bladder and kidneys. Black Onyx helps to protect the stomach against excess (stomach) acid.