何 is mother of 真珠?

Mother of 真珠, また known as 真珠層, is an organic material produced 内部 貝. It is not known exactly 何 elements causes its formation.
Oysters secrete it as a defense mechanism 基準 foreign agents, such as grains of sand.

It 推奨 be remembered that 真珠層 is not the same as 真珠. The 真珠 is an organic gem composed of layers of 真珠層, which 通常 adopts a ラウンド shape.

The uses of mother-of-真珠 are varied, 両方 for decorative elements and for jewelry or watches. Traditionally, mother-of-真珠 spoons have been made to eat caviar.