Fig. 1. XRD pattern of samples
(a): XRD pattern of samples from Xi’an;(b): XRD pattern of samples from Yunnan Q: Quartz; Cin: Cinnabar; D: Dolomite; C: Calcite;Arg: Aragonite; I: Illite; Kln: Kaolinite

Fig. 2. SEM images of samples
(a): Sample from Xi’an; (b): sample from Yunnan

Fig. 3. The image of SEM (a) and EDS (b) of illite in sample from Xi’an

Fig. 4. IR spectra of samples
(a): IR spectrum of samples from Xi’an;(b): IR spectrum of samples from Yunnan

Fig. 5. The functional area of IR spectrum of samples

Fig. 6. Raman spectra of samples
(a): Raman spectrum of quartz; (b): Raman spectrum of calcite and dolomite; (c): Raman spectrum of cinnabar; (d): Raman spectrum of stibinite