Tiger's eye
Chatoyant gemstone from the quartz family
Tiger's eye
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.
Read on Wikipedia · Image Marek Novotnak, CC BY-SA 4.0
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