Mother-of-Pearl is made up of layers of materials that differ in composition on a gradient. On one side they are made of a calcium carbonate composite, and then the layers change gradually to become mostly made of a silk protein filler on the other side
Mother-of-pearl is made up of layers of materials that differ in composition on a gradient. On one side they are made of a calcium carbonate composite, and then the layers change gradually to become mostly made of a silk protein filler on the other side