Identification and composition of carbonate minerals of the calcite structure by Raman and infrared spectroscopies using portable devices
Résumé
h i g h l i g h t s
A portable Raman device with a 532 nm excitation laser and a portable infrared spectrometer with ATR
(Attenuated Total Reflection) mode were used to analyse the spectral features associated with the iden-
tification and compositional variation of Ca-Mg-Fe-Mn natural carbonate minerals with a calcite struc-
ture (calcite, ankerite, dolomite, siderite, rhodochrosite, and magnesite). A systematic study of the
variations of the peak positions with various compositional ratios was carried out. Most of the band posi-
tions were shifted to lower wavenumbers with increasing ionic radius or atomic mass of the divalent
cations but the band of the translational lattice (T) mode in Raman and the symmetric bending (m4) band
in the mid-infrared were the most sensitive. Therefore, the elemental variation of the Ca-Mg-Fe-Mn ratio
in this carbonate series can be estimated from Raman and infrared band positions from spectra acquired
with portable spectrometers.
Characterization of carbonate minerals by using portable Raman and IR instruments. Identification and composition determination of Ca-Mg-Fe-Mn carbonate minerals. Elemental variation in carbonates using band shifts in Raman and infrared spectra.
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