Some of the most common sulfates have been investigated by non-contact Raman spectrography. For barite and anhydrite group the vibrational mode ν₁ decreseas as the atomic mass increseas.The Raman spectrum of chalcocyanite shows two strong bands at 1013 cm^-1 and 1045 cm^-1 interpreted as ν₁ modes. The bands at 423 cm^-1, 448 cm^-1, 480 cm^-1 and 514 cm^-1 have been assigned to the ν₂ sulfate mode, the bands at 1101 cm^-1 and 1205 cm^-1 to the ν₃ vibrational modes and the bands at 622 cm^-1 and 670 cm^-1 to the ν₄ mode of SO₄. The bands at 250 cm^-1, 269 cm^-1 and 347 cm^-1 have been interpreted as vibrations of Cu-O bonds. Szmikite shows intense vibrations at 1021 cm^-1 interpreted as ν₁ mode of SO₄. The ν₂ and ν₃ modes the bands are at 425 cm^-1 and 493 cm^-1 respectively 1089 cm^-1 and 1189 cm^-1. The bands at 623 cm^-1 and 654 cm^-1 were assigned to the ν₄ mode. The translational mode T(H₂O, Mn) was determined at 263 cm^-1.

Raman spectra, sulfates, chalcocyanite, szmikite