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Study on Mollusk Shells by Laser Micro-Raman Spectrometry

ZHANG Gang-sheng 1,2, XIE Xian-de 1 (1.Guangzhou Institute of Geochemistry, CAS, Guangzhou, 510640; 2.College of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004)  
Two important pearl-culturing mollusk shells, which include Pinctada martensii(Dunker) and Hyriopsis cuningii(Lea), have been studied by laser micro-Raman spectrometry. In shells of Hyriopsis cuningii(Lea), the aragonite minerals and carotenoids were detected in both nacreous and prismatic layers by micro-Raman spectrometry. In contrast, in shells of Pinctada martensii(Dunker), the calcite minerals were detected in its prismatic layers. In prismatic layers of both mollusk shells, one kind of calcium carbonate materials, which perhaps occurs as super-fine grade, has been found in organic matrix among crystals of prismatic layers.
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