Nacre is a hard, iridescent, crystalline substance secreted by some animals in response to an irritant. Which of these precious substances contains nacre?

Coral

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Amethyst

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Pearl

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Aquamarine

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Solution

The correct option is A Pearl
Nacre, also known as mother-of-pearl is a crystalline substance that creates the shiny visual effect attributed to pearls.
It is an organic substance secreted by mollusks.
It is a strong and resilient material that is lightweight and transparent, allowing light to pass through its surface, creating a subtle glow on the pearl's surface.

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