The cat's eye effect can be seen in cabochon cut quartz, chrysoberyl and tourmaline and is known as "chatoyancy" and is shown as a wavy and changeable band of light across the top of the cabochon.
CATS EYE - Considered to be a very lucky stone. Stimulates psychic abilities and enhances awareness. Dispels unwanted energy from the etheric layer and protects the aura from all forms of negativity. Relieves headaches, stress & pain.