Pearl is an organic gem formed in oysters - saltwater mollusk or freshwater mussels . A pearl is formed , when a foreign particle enters its mantle or body tissue, the body cells build up concentric layers (known as 'nacre') around the particle to protect the mantle.
Chemical composition:
Calcium Carbonate with organic matter
CaCO3 + conchiolin + H2OCommon Colours :White, gray, yellow, pink, black, brown,blue
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