Infrared spectroscopic investigations of the calcite-rhodochrosite and parts of the calcite-magnesite mineral series.

BÖTTCHER, M.E., GEHLKEN, P.-L. & USDOWSKI, E. (1992):
Infrared spectroscopic investigations of the calcite-rhodochrosite and parts of the calcite-magnesite mineral series.

The infrared spectroscopic measurements of synthetic and natural carbonate samples show that significant frequency shifts in the 2 and 4 vibrational bands of the carbonate ion group occur in the calcite-rhodochrosite and calcite-magnesite mineral series as a function of the chemical composition. These shifts are due to cationic substitution, reflecting the different ionic radii and masses of the end-members. A tentative model for the variations of 2 and 4 in the ternary system CaCO3-MnCO3-MgCO3 is presented.