Wiktionary
alt. A chatoyant gemstone that is usually yellow- to red-brown, with a silky luster. n. A chatoyant gemstone that is usually yellow- to red-brown, with a silky luster.
Wikipedia
Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock that is a golden to red-brown colour, with a silky lustre. Members of the quartz group, Tiger's eye and the related blue-coloured mineral Hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.
Usage examples of "tiger's eye".
Had a sheen something like a crocidolite, but of course it didn't have the tiger's eye coloring of crocidolite.
Charles fancied he could see a tiny blue fleck in that deep brilliance, as if the tiger's eye had eaten one of his own.
Jake caught Tiger's eye for a second, then turned the autopilot off.