Multiple choice

The main constituents of pearl are _______.

  1. calcium carbonate and magnesium carbonate

  2. calcium oxide and ammonium chloride

  3. aragonite and conchiolin

  4. ammonium sulphate and sodium carbonate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pearls are biological products formed within the soft tissue of living shelled mollusks. Chemically and structurally, they consist primarily of calcium carbonate in the form of aragonite platelets bound together by an organic matrix protein called conchiolin.

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