RRUFF ID R090047 -The second Raman spectrum that we consider is RRUFF ID R090047. Graphite from Merelani, Tanzania (Data source: Wendell Wilson). The identification of this mineral has been confirmed by X-ray diffraction (RRUFF). The sample is unoriented, and the instrument settings are: Thermo Almega XR 532nm @ 100% of 150mW. As we can see from Fig. , the use of further components, such as at about 1500 and 1550 cm -1 , could further improve the fit, but this is beyond the aim of this discussion. In the Fig. , for the decomposition of the Raman spectrum we used three components. In the following Fig. , the components are four. We added a component between the two main peaks. Fig. : The best fit (green) onto ROD 3500021 and four q-Gaussian components.