摘要
It was demonstrated by X-ray diffraction and SEM that the shell of Anodonta woocliana wocdiana consists of internal layer (lamellar aragonites with 0.37 μm of spacing) and external layer (prismatic calcites with 25--82 μm in diameter), and that the boundaries between the prismatic calcite and the lamellar aragonite appear cellular (Fig. la, b). It was also found that there are some arch growing lines (Fig.
