Multiple choice

Chemical composition of pearl is

  1. Calcium carbonate

  2. Calcium carbonate & magnesium

  3. Calcium Sulphate

  4. Calcium chloride
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A Correct answer
Explanation

Pearls are composed primarily of calcium carbonate (CaCO3) in the form of aragonite crystals, layered with conchiolin (an organic protein) to create the characteristic nacre structure. This combination gives pearls their luster and iridescence.

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