engleski

Identification of nesosilicate minerals from Macedonia by powder XRD and vibrational spectroscopy

The powder XRD and vibrational (infrared and Raman) spectroscopy are used for identification of seven common nesosilicate minerals from the Republic of Macedonia: almandine, Fe3Al2(SiO4)3 ; spessartine, Mn3Al2(SiO4)3 ; zircon, ZrSiO4 ; titanite, CaTiSiO5 ; olivine, (Mg, Fe)2SiO4 ; staurolite, Fe2Al9O6(SiO4)4(OH)2 and kyanite, Al2SiO5. The identification is based on the comparison of their powder XRD patterns and vibrational spectra with the corresponding XRD, FTIR and Raman literature data for the analogue mineral species originating all over the world. In general, rather expressed similarity among the infrared spectra of the minerals are observed being mainly due to their common structural characteristics. The similarity is especially expressed in the case of the isomorphous almandine and spessartine which form solid solution. The similarity between the Raman spectra of the studied minerals is less expressed compared to the IR analogues. The difficulties appeared in the process of the identification of staurolite and olivine (forsterite or fayalite) specimens related to the lower quality of their Raman spectra are outrun by use of their powder XRD patterns.

Macedonia ; minerals ; nesosilicates ; powder diffraction ; vibrational spectroscopy

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