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What is the composition of pearl?...

What is the composition of pearl?

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Composition of pearl
Pearl comprises of water, organic matter, calcium carbonate and the residue. (1) Water: 2-4%, (2) Organic matter: 3.5-5.9%, (3) Calcium carbonate: 90% and (4) Residue: 0.1-0.8% carbonate: 90%.
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