What is the role of conchiolin in nacre?

Conchiolin plays a crucial role in the structure of nacre, or mother-of-pearl, by serving as an organic matrix that holds aragonite platelets together. Nacre is composed of alternating layers of aragonite (a form of calcium carbonate) and conchiolin, which is a protein-based substance. This organic component is essential in the formation and stability of nacre, providing flexibility and resilience to the structure.

The ability of conchiolin to bind the aragonite platelets is fundamental in creating the iridescent and layered appearance of nacre, making it not only efficient in structural integrity but also contributing to its unique optical properties. The interlocking nature of the aragonite layers, held together by conchiolin, enhances the strength and durability of nacre, allowing it to serve various functions such as protection for the mollusk and its often delicate internal structures.