Onyx is a cryptocrystalline form of quartz and is known as nail of a finger or claw in Greek mythology. The layers in this stone range from translucent to opaque in some stones and strongly white or black banded. It is also available in colors of white, tan and brown, the most stunning of which is the black Onyx. Black onyx is the most commonly available stone the world over and is therefore quite affordable. It is often used as a shiny background for jewelry due to its fine texture and smoothness. Among the many positive attributes of Onyx are its ability to eliminate negative thinking and sharpen the wits of the wearer. It is also said to bring spiritual inspiration and is of great assistance in holding emotions and passions under control.