Minerals from Macedonia XII. The dependence of quartz and oral color on trace element composition - AAS, FT IR and MICRO-RAMAN spectroscopy study

Makreski, Petre and Jovanovski, Gligor and Stafilov, Trajče and Boev, Blazo (2004) Minerals from Macedonia XII. The dependence of quartz and oral color on trace element composition - AAS, FT IR and MICRO-RAMAN spectroscopy study. Bulletin of the Chemists and Technologists of Macedonia, 23 (2). pp. 171-184. ISSN 0350 – 0136

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Abstract

The dependence of the color of quartz and opal natural minerals, collected from different localities in the Re­ public of Macedonia (Alinci, Belutce, Budinarci, Mariovo, Sasa, Sazdevo, Caniste, Cesinovo, Zletovo) on their ele­ment composition is studied using Fourier transform infrared spectroscopy (FT IR), micro-Raman spectroscopy and atomic absorption spectrometry (AAS). In order to determine the content of different trace elements (AI, Cd, Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb and Zn), 15 quartz and 2 opal mineral samples, using flame atomic absorption spectrometry (FAAS) and Zeeman electrothermal atomic absorption spectrometry (ETAAS) are studied. To avoid matrix interferences, the method for elimination of silicium is proposed. Optimal instrumental parameters for ETAAS determination (temperature and time for drying, pyrolysis and atomizing) are established by extensive test­ ing for each investigated element. It is found that the milky white color of quartz minerals is due to the presence of traces of Ca, the appearance of black color is the result of the existence of Pb, Mn and AI impurities, and the occur­rence of Fe and Cr introduce appearance of red and green color, respectively. Preliminary identification of the minerals is based on the comparison of our results, obtained by using the in­ frared and Raman vibrational spectroscopy, with the corresponding literature data for the analogous mineral species originating all over the world. An overview of the basic morphological and physico-chemical characteristics of the quartz and opal minerals and the geology of the localities is given. The colored pictures of the studied quartz and opal minerals are presented as well.

Item Type: Article
Uncontrolled Keywords: quartz; opal; color; minerals; Macedonia; FT-IR spectroscopy; Raman spectroscopy; atomic absorption spectrometry
Subjects: Social Sciences > Other social sciences
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Blazo Boev
Date Deposited: 29 Nov 2012 13:23
Last Modified: 11 Jun 2013 13:05
URI: http://eprints.ugd.edu.mk/id/eprint/2449

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