Sardonyx is a combination of two stones, Sard and Onyx. It is a banded black and white variety of Chalcedony that originated in rock cavities. Sardonyx healing crystals are stones of protection and strength. Sardonyx promotes integrity, attracts loyal friends and good fortune, and can bring lasting happiness and stability to partnerships. Sardonyx can increase stamina, vigor and self-control. Sardonyx helps open and balance the Root Chakra.