Chemical, spectra-structural and microscopy study of the natural tridymite from Republic of Macedonia

Pavlovski, Blagoj and Reka, Arianit and Boev, Blazo and Boev, Ivan and Makreski, Petre (2018) Chemical, spectra-structural and microscopy study of the natural tridymite from Republic of Macedonia. In: 25th Congress of Chemists and Technologists of Macedonia, 19–22 Sept 2018, Ohrid, R. Macedonia.

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The naturally occurring tridymite collected from Kavadarci region, Republic of Macedonia represents a pretty loose, soft, weak rock with white to greyish color that resembles diatomaceous earth. The chemical composition of the samples was determined by classical silicate analysis and the results revealed presence of the following oxides (wt%): SiO2 (90.17), Al2O3 (1.79), Fe2O3 (0.328), MnO (0.0004), TiO2 (0.055), CaO (0.132), MgO (0.20), K2O (0.52), Na2O (0.25), and LOI (6.15). Results from the X-ray diffraction examination enabled to determine presence of predominant tridymite crystalline phase, associated with quartz and muscovite. The IR spectrum of the naturally occurring tridymite exhibits absorption bands at 791 cm-1 and 1100 cm-1 ascribed to the stretching Si– O–Si vibrations. The band at 3650 and 1640 cm-1 are assigned to the stretching and bending vibrations from the absorbed water, respectively. Characteristics hexagonal crystals of tridymite and globular forms present in the raw material were found from the SEM investigations

Item Type: Conference or Workshop Item (Poster)
Uncontrolled Keywords: natural tridymite, XRPD, FTIR, SEM.
Subjects: Natural sciences > Chemical sciences
Natural sciences > Earth and related environmental sciences
Engineering and Technology > Other engineering and technologies
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Biljana Kosturanova
Date Deposited: 08 Oct 2018 12:25
Last Modified: 08 Oct 2018 12:25

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