About the assignment of the band, it is given in ; we find told that v1,v2,v3 and v4 modes are the normal vibrations of the carbonate ion; v1 is the symmetric C-O stretching mode, v2 is the CO3 out-of-plane deformation mode, v3 is the asymmetric C-O stretching mode and v4 is the OCO bending, in-plane, deformation. In the articles mentioned above, we do not find any deconvolution in components of the v3 band. Moreover, in Andersen and Brecevic, it is told that this band can be split in v3a and v3b components. In the decompositions of our Figures , we have used two or three components, with rather good results. Further studies of the other carbonate minerals are necessary to test the use of q-BWF functions for IR spectra and the splitting of v3 band.