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Tiger's-eye, also called "tiger eye" and "tigers eye," is a very popular gemstone that displays a chatoyancy (cat's-eye) when a polished stone is moved back and forth in incident light. It is a quartz gemstone, usually amber to brown in color, that forms when fibers of the mineral crocidolite are replaced by silica. This structure of parallel fibers is preserved in the stone, and the chatoyant "eye" crosses the parallel fibers at right angles. The best specimens of tiger's-eye are usually cut en cabochon in an orientation that yields the best display of chatoyancy.