chatoyancy

plural of chatoyance

(jewelry) Having a certain optical reflectance effect, which can be likened to the sheen of a spool of silk.

(mineralogy) A hard stone, such as the cat's-eye, which presents on a polished surface, and in the interior, an undulating or wavy light.

plural of chatoyant

The state or condition of being chatoyant.

Changeableness of color, as in a mineral; play of colors.

plural of chatoyancy