What's the difference between chatoyant and cymophane?

Chatoyant

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Definition:

• (a.) Having a changeable, varying luster, or color, like that of a changeable silk, or oa a cat's eye in the dark.
• (n.) A hard stone, as the cat's-eye, which presents on a polished surface, and in the interior, an undulating or wary light.

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Cymophane

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Definition:

• (n.) See Chrysoberyl.

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