Raman spectra of ice and salt hydrates in synthetic fluid inclusions

Raman spectra of ice, NaCl·2H2O (hydrohalite), CaCl2·6H2O (antarcticite), α-CaCl2·4H2O, γ-CaCl2·4H2O, CaCl2·2H2O (sinjarite), MgCl2·12H2O, FeCl2·6H2O, FeCl2·4H2O, and a LiCl hydrate are characterized in synthetic fluid inclusions in quartz at about − 190 °C. Each hydrate can be distinguished on its characteristic Raman bands, which occur at wavenumbers in the range of the stretching vibration mode of water (2800 to 4000 cm− 1). The spectra provide the basis for the interpretation of Raman spectra obtained in natural fluid inclusions.