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| Influence Factors of Transparency on Shuikeng Stone from Shoushan |
| DENG Yu-qing, CHEN Tao* |
| Gemmological Institute，China University of Geosciences，Wuhan 430074，China |
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Abstract X-ray powder diffractometry (XRD), Infrared (IR) spectroscopy, Scanning electron microscope (SEM) and Differential thermal analysis (DTA) were used for studying the transparency in fluence factors of Shuikeng Stone from Shoushan, China. Results of IR spectroscopy and XRD indicated that the main mineral composition of Shuikeng Stone is Dickite. Order degree of Dickite can be indicated by intensity difference of wave number 3 704 and 3 621 cm-1 in IR spectroscopy and intensity difference of diffraction peaks in XRD pattern. Intensity ratio of wave number 3 704 and 3 621 cm-1 in IR spectroscopy (OI) was calculated, the result showed that OI has nothing to do with the transparency of the samples. DHI was calculated by intensity of diffraction peaks of crystallographic plane (111) and (111), the results showed that DHI also has nothing to do with transparency of samples. Results of SEM showed that the crystal particles in transparent samples show a uniform appearance and similar size and the crystallinitydegree of Dickite has nothing to do with its transparency. Results of DTA indicated that the adsorption water in transparent samples is less than that in opaque samples, and the constitution water in transparent samples is closer to the theoretical water content of kaolinite-group mineral than opaque samples. Deficiency of constitution water has caused the decline of structural integrity, accordingly, the charge balance of samples was destroyed. Adsorption water exists in crystal lattice of samples as impurity molecule because of the decrease in charge balance, these impurity molecules would decrease the transparency.
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Received: 2017-04-30
Accepted: 2017-09-10
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Corresponding Authors:
CHEN Tao
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