Introduction -Here we consider the Raman broad scans on minerals of the vivianite group, which are kindly offered by the RRUFF database. The minerals of the vivianite group are of the general formula A3 2+ (XO4)2•8H2O. In this formula, A 2+ can be Co, Fe, Mg, Ni, Zn and X can be As or P . In RRUFF database, we can find vivianite, baricite, bobierrite and other minerals of the group. Of the Raman broad scans we will consider the range between 2000 and 4000 cm -1 , which contains the hydroxyl-stretching region (for water, from 2800 to 3800 cm -1 ). We have already considered this region when we studied the Raman spectroscopy of water; we proposed specifically the decomposition of this large OH stretching Raman band in components with the q-Gaussian profiles. Being the q-parameter of q-Gaussian functions related to the correlation time of stochastic Kubo modelling of fluctuations, we stressed the use of this parameter to characterize the local environments of O-H bonds. We further discussed the OH-stretching band of ice, to understand how the decomposition in q-Gaussians changes in the number of components and values of q-parameters. Here, besides discussing vivianite OH-stretching band, we will propose a further analysis of the Raman spectroscopy on water, to stress the crucial points of it. We will apply the same approach used for water, that is a decomposition of the spectrum in q-Gaussian components, to the scans on vivianite. We will compare the results obtained by means of q-Gaussians with the results given by literature. Baricite and bobierrite are also studied.