The Raman and infrared spectra of calcite have been discussed in several publications. For instance, in , aragonite and calcite have been the subject of an infrared spectroscopy investigation. In , we can find the study of Raman and mid-range infrared spectra, that the researchers have been measured on natural limestone and dolomite minerals. Four prominent absorption bands have been identified. Moreover, the "positions of the wavenumbers are unique for each carbonate mineral and are thus diagnostic of their mineralogy". Previously, in Andersen and Brecevic, 1991, the infrared spectrum of an amorphous form of calcium carbonate had been obtained and proposed with the spectra of crystalline polymorphs (vaterite, aragonite and calcite). proposed the Raman spectra of vateritic calcium carbonate. Ultra-fine calcite samples, possessing similar particle size in different agglomeration states, have been synthesized and studied by , with SEM-TEM measurements, infrared and Raman spectroscopy. , by means of Raman spectroscopy, investigated carbonates, that is the "high-pressure and high-temperature behaviour of calcite, magnesite, dolomite and aragonite". Previously, , studied the Raman spectrum of calcium carbonate at high pressures.