Original paper

Minerals from Macedonia. IV. Discrimination between some carbonate minerals by FTIR spectroscopy

Jovanovski, Gligor; Stefov, Viktor; Šoptrajanov, Bojan; Boev, Blažo

Abstract

The use of FTIR spectroscopy to distinguish between some geologically important carbonate minerals (calcite - CaCO3, aragonite - CaCO3, siderite - FeCO3, magnesite - MgCO3 and dolomite - CaMg(CO3)2) originating from Macedonia and to detect mineral impurities in them is considered. It was shown that the series of the studied isomorphous calcite type minerals is an ideal test case for the evaluating the influence of the corresponding cation upon the band frequencies of the carbonate ν3, ν2 and ν4 modes in their infrared spectra. It enables to distinguish the isomorphous calcite type carbonates from one another. In the course of the quantitative determination of the composition of mixtures it is shown that the limit of detection of impurities of aragonite in the mixtures with calcite (or other calcite type minerals) is around 1wt %. The spectra of natural calcite and siderite were compared to those of their synthetic analogues.

Keywords

carbonate mineralsmacedoniadetectiondiscriminationftir spectroscopy