The calcite layer and aragonite layers are multi-scale structure , and a small quantity of organic matrix distributes mainly in their grain boundary.
贝壳中的方解石和文石层均呈多级超微结构，微量的有机质在晶界和晶内呈不连续分布。
2
It is indicated that the shell is composed of calcite with Rhombohedral structure as well as aragonite with Orthorhombic structure.
研究表明：香螺壳体主要由方解石构成，其次为具有正交晶系结构的文石。
3
The structural color of nacre in bivalve shells of Pinctada maxima is derived from the combination effects of aragonite-protein multilayer structure and yellow pigments in nacre.