Fig. 1. Blue serpentine samples

Fig. 2. Mineral characteristics of blue serpentine under crossed-polarized light
Ant: Antigorite; Dol: Dolomite

Fig. 3. SEM images of blue serpentine
(a): Scaly serpentine; (b): Rhombohedron dolomite; Ant: Antigorite; Dol: Dolomite

Fig. 4. XRD pattern of blue serpentine

Fig. 5. FTIR spectra of blue serpentine

Fig. 6. Raman spectra of blue serpentine
Ant: Antigorite; Dol: Dolomite; Cal: Calcite

Fig. 7. UV-Vis spectra and integral area of blue serpentine
(a): UV-Vis spectra; (b): Integral area