Define the pearl, and classify them. Describe the mineralization of pearl.

A pearl is a natural or cultured product formed within the soft tissue of a living shelled mollusk, primarily oysters, as a defense mechanism against an irritant such as a parasite entering their body or damage to their fragile body. Pearls are composed of layers of aragonite and conchiolin, which are the same substances that make up the mollusk's shell. When a foreign substance, like a piece of sand or a parasite, enters the mollusk, it secretes layers of nacre (a combination of aragonite and conchiolin) around the irritant, gradually forming a pearl.

Pearls are classified into two main categories: natural pearls and cultured pearls. Natural pearls are those that form spontaneously in the wild without human intervention, whereas cultured pearls are produced by humans in controlled environments. Cultured pearls are grown by introducing an irritant into a ____ _________ ___ _____ ______ ___.
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