<Tr> <Th> Luster </Th> <Td> Silky </Td> </Tr> <Tr> <Th> Specific gravity </Th> <Td> 2.64--2.71 </Td> </Tr> <P> Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red - brown colour and a silky lustre . As 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 . </P> <Table> <Tr> <Td> Unpolished tiger's eye from South Africa </Td> <Td> Oval shape tiger's eye with iron stripes </Td> </Tr> </Table>

What does the stone tiger's eye mean
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