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MOP PEARL
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FRESHWATER PEARL
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Mother of Pearl is the iridescent coating on the inside of mollusk shells. It is so named because when an irritant gets inside a shell, the shell protects itself by coating the irritant with the same material of its lining - therefore, this substance is the creator, or mother, of pearls.
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When an irritant enters a mollusk's shell, a lustrous substance called nacre is secreted to coat the irritant for protection and a freshwater pearl is formed.
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