The optical reflectance effect seen in certain gems and fabrics that creates a narrow, luminous band resembling a cat's eye.
From French 'chatoyer' (to shimmer like a cat's eye). The noun form of chatoyant. Tiger's eye gemstone is the most common example.
The NOUN form of that cat-eye shimmer! Tiger's eye stones, certain silk fabrics, and of course actual cat eyes all display chatoyance! It's captured light doing a tiny dance! ðŸ±â€ðŸ‘¤ðŸ’Ž
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