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Published on: April 12, 2017
Moganite in selected Polish chert samples: the evidence from MIR, Raman and X-ray studies
M Sitarz1, P Wyszomirski1, B Handke1
1AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Mickiewicza 30, 30-059 Cracow, Poland.
Abstract:
The authors discuss the results of structural investigations (XRD, MIR, Raman) of Polish cherts from different geological formations. The X-ray diffraction analyses explicitly confirmed the presence of moganite, which was identified on the basis of satellite XRD peaks positioned/occurring close to the quartz reflections and the additional reflections with the dhkl values 4.456 and 3.101 Ǻ, and established its amounts as varying between about 1 and above 17 wt%. The mid-infrared and Raman spectroscopy also proved the presence of moganite, indicated by the 695 and 560-555 cm(-)(1) bands, respectively. These analytical finds allow to identify moganite in samples containing various SiO2 polymorphs.
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