| Tiger's eye | |
|---|---|
 | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | Silica (silicon dioxide, SiO2) |
| Identification | |
| Colour | golden to red-brown |
| Mohs scale hardness | 6.5-7 |
| Luster | Silky |
| Specific gravity | 2.64–2.71 |
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.[1][2]
- ^ "Tiger's Eye". mindat.org. Retrieved 16 May 2016.
- ^ Heaney, Peter; Fisher, Donald (April 2003). "New interpretation of the origin of tiger's-eye". Geology. 31 (4): 323–326. Bibcode:2003Geo....31..323H. doi:10.1130/0091-7613(2003)031<0323:NIOTOO>2.0.CO;2.