It is shown that the emission spectra of manganese activated zinc orthosilicate, zinc beryllium silicate and calcium silicate can be expressed as the sum of several Gaussian distribution curves. The observed distributions for zinc orthosilicate and for calcium silicate can be fully given as the sum of three bands, while that of zinc beryllium silicate requires five bands. In general, only the amplitude of the bands is affected by changes in composition with their location and sharpness remaining unchanged.