STRUCTURAL COLORS OF NACRE. “The lustrous nacre of the abalone shell is made up of polygonal (usually hexagonal) tiles of a very hard crystalline form of calcium carbonate, aragonite, cemented in a thin matrix of conchiolin – polysaccharide and protein fibres. The tiles are each a single crystal and are tessellated in stacked layers. Each layer is 0.5 micron thick.”
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