is a semiprecious variety of agate displaying different colors in parallel layers. Onyx is found in many parts of the world, buy is primarily mined in India and South America. Manmade onyx, that has been permanently dyed, can be found in blue, green, and black. Natural onyx is normally found in red, brown, white, and occasionally black. The terms "onyx marble" and "Mexican onyx" are often incorrectly used to describe travertine, and not true onyx. Onyx is extensively used in jewelry and carving, but is also used in kitchens and bathrooms for tile and countertops.