Tiger’s eye is an opaque variety of quartz, with a golden-yellow color. It exhibits a characteristic linear iridescence like a moving reflection. These lines are golden and brown in color and retain the fibrous structure of crocidolite. This very characteristic optical effect is known by the French word chatoyancy, which means “cat’s eye”. The Tiger’s eye is encountered in USA, South Africa, Namibia, and Brazil. There is a darker tiger’s eye variety called Hawk’s Eye, which is deep blue, and another one called Bull’s Eye, which is deep red.