Stone's names:Tiger eye, also spelled tiger's-eye and tigereye. Tiger eye is also called crocidolite cat's-eye or African cat's-eye Technical/details:Tiger Eye is made from Quartz which is Silica dioxide. Color: Yellow, Red and Blue. Description:Tiger eye is quartz that contains oriented fibres of crocidolite that have been replaced by silica. Tiger eye is displaying chatoyancy (a vertical luminescent band like that of a cat's eye) . The name's origin:Tiger eye with its bands resembles an eye of tiger, so it is received its name due to this similarity. Hardness: 7