In the Fig. we can see that the band has its peak at 511 cm -1 . Let us try to consider, as we did for the RRUFF sample, two components having their centers at the same distance from the peak (in the Fig. , the case +/-4 cm -1 is shown). The fitting onto these data is proposed in the Fig. . In the Results given above are further encouraging investigation on other samples. It seems possible to determine the two components of the band about 515 cm -1 .