Raman spectra of carbonates of calcite structure

Six new Raman spectra of carbonates of calcite structure (D63d) are presented and compared with the previously reported siderite and calcite spectra. Correction on the assignment of the electronic Raman in siderite was done by this comparative study. In calcite a new line was observed and assigned as an Eg+A1g mode. Some samples were prepared by hydrothermal synthesis and the technique is described.