. The main constituents of pearl are

(a) Calcium carbonate and magnesium carbonate

(b) Aragonite and conchiolin

(c) Ammonium sulphate and sodium chloride

(d) Calcium oxide and ammonium chloride

Answer Posted / sabita kumari

Typically the build-up of a natural pearl consists of a
brown central zone formed by columnar calcium carbonate
caco3,About 95% of nacre consist of layers of calcium
carbonate (CaCO3)
the answer is calcium carbote and magnesium cabonate

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