CHATOYANCY
[noun]
1. also chatoyance or cat’s eye effect - an optical reflectance effect seen in certain gemstones. Coined from the French “œil de chat,” meaning “cat’s eye,” chatoyancy arises either from the fibrous structure of a material, as in tiger’s eye quartz, or from fibrous inclusions or cavities within the stone, as in cat’s eye chrysoberyl.
2. the changing of lustre or colour.
3. like a cat’s eye.
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