Motherofpearl

Mother of pearl, also known as nacre, is a natural biomineral and organic composite produced by some mollusks as the innermost layer of the shell. It lines the mantle cavity and covers the inner surface of the shell, giving an iridescent sheen.

Nacre is composed of microscopic platelets of aragonite (a calcium carbonate mineral) arranged in layers separated by an organic matrix of proteins and polysaccharides. The layered structure causes light to interfere and reflect, producing the characteristic pearl-like glow.

Occurrence and production: Found in many species of mollusks, particularly pearl oysters (Pinctada) and abalones (Haliotis); also in freshwater mussels. It is secreted continuously by the mantle and accumulates in concentric layers as the animal grows. If a foreign object enters the shell, nacre may envelop it, forming a pearl.

Uses and identification: Mother of pearl is prized for its iridescent luster and is used in decorative inlays for furniture and musical instruments, buttons, jewelry, and decorative veneers on crafts and watches. It is harvested from shells and can be processed into sheets or thin veneers.