In this work, we consider the calcite and its spectra (Raman and infrared) that we can find in the RRUFF database . This database is useful for testing new approaches to the deconvolution of spectra by means of functions which are not included among the line shapes commonly available in curve fitting software (that is, Gaussian, Lorentzian, Voigt, pseudo-Voigt functions). Here we apply q-Gaussian and q-BWF functions to decompose the spectra of calcite. The q-Gaussian functions had been derived in the framework of Tsallis analysis of entropy . Their use for Raman spectroscopy has been proposed for the first time by . The q-BWF functions have been defined by , to generalize the BWF (Breit-Wigner-Fano) functions, and proposed as fitting functions of asymmetric peaks in Raman spectroscopy. Here we show that this generalization of BWF functions can be suitable for the decomposition of infrared spectra too.