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    Volume 34 Issue 5
    Sep.  2009
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    LI Li-ping, 2009. Composition of Seawater and Fresh Water Cultured Pearls. Earth Science, 34(5): 752-758.
    Citation: LI Li-ping, 2009. Composition of Seawater and Fresh Water Cultured Pearls. Earth Science, 34(5): 752-758.

    Composition of Seawater and Fresh Water Cultured Pearls

    • Received Date: 2009-03-18
    • Publish Date: 2009-09-25
    • Petrographic microscope, XRD, infra-red spectrometer, electron spin resonance (ESR), Raman spectrometer, atomic absorption spectrometer were used to analyze the mineralogical and chemical composition of seawater and fresh water cultured pearls in this paper.The results show that pearls mainly consist of aragonite, with very few varterite and calcite.Fresh water cultured pearls are rich in Mn, but sea water cultured pearls rich in Na, K, Mg, and Sr.The enrichement character of freshwater pearl and seawater pearl is very similar to that of fresh water and seawater.There are detectable differences in chemical composition among different colored varieties.Violet pearls are slightly rich in Mg and Mn, orange pearls distinctively rich in Fe, and black seawater pearls probably have high organic contents.By contrast, white pearls contain little coloring elements such as Fe, Mg, and Cr.

       

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