Abstract：The two shell layers, i.e., the ligament (HCL) and the inner nacreous layers (HCN) from bivalve shells of Hyriopsis cumingii, both composed of aragonite by powder XRD analysis, were comparatively analyzed by FTIR spectrometry. The results show that: (1) the features of ν2 and ν3 bands of aragonite are clearly different between the two shell layers, as the ν2 band of HCN aragonite shows a 6.5 cm-1 blue-shift, but the ν3 band shows a 22.7 cm-1 red-shift compared to that of HCL aragonite; (2) the full width at half maximum of ν2 and ν3 bands of HCN aragonite is nearly doubled compared to that of HCL aragonite; (3) however, the features of ν1 and ν4 bands are independent on shell layers. It is suggested that the anisotropic frequency shifts of the aragonite in HCN and HCL perhaps result from the size effects of aragonite crystals.
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