The main constituents of pearls are?

The main constituents of pearls are?

1. aragonite and conchiolin

2. calcium oxide and ammonium chloride

3. ammonium sulphate and sodium carbonate

4. calcium carbonate and magnesium carbonate

Correct Option: Option D,

calcium carbonate and magnesium carbonate

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The chief component of the nacre that constitutes the pearl is aragonite (CaCO3). Nacre also contains a small amount of conchiolin, a horn like organic substance (albuminoid) that is the main constituent of the mollusk's outer shell.