What is the main constituent of a Pearl

• GC Metals Non-Metals

What is the main constituent of a Pearl?

1. Calcium carbonate and magnesium carbonate
2. Calcium carbonate only
3. Calcium sulphate only
4. Calcium oxide and calcium sulphate

Answer

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

The correct option is A.