Nacre (Mother of Pearl, Heart of Pearl)
Nacre or Mother of Pearl, in past it was also called as Heart of Pearl, is a smooth shining iridescent substance forming the inner layer of the shell of some mollusks, especially oysters and abalones, used in ornamentation.
![Nacre (Mother of Pearl [Heart of Pearl])](https://upload.wikimedia.org/wikipedia/commons/0/08/NautilusCutawayLogarithmicSpiral.jpg "Nacre (Mother of Pearl [Heart of Pearl])")
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