Fig. 1. Five turquoise beads unearthed from tomb No.M52 (a—e); Turquoise in Qingu area, Hubei (f); Turquoise in Bijiashan area, Anhui (g)

Fig. 2. Infrared reflectance spectra of five Haochuan turquoise beads and Hubei and Anhui turquoise samples (a); Infrared Spectra(3 600~3 200 cm^-1) of turquoise samples from Haochuan Cemetery (b); Infrared Spectra (3 600~3 200 cm^-1) of turquoise samples from Haochuan Cemetery and lacquerware sample from Liangzhu^[13](c); Infrared spectra (1 200~400 cm^-1) of turquoise samples from Haochuan Cemetery(d)

Fig. 3. M52-2 surface etch pits (a); M52-8 surface polishing surface can be seen with polished small surface (b)

Fig. 4. Drilling situation of five turquoise beads

Table 1. Basic characteristics of five turquoise beads in Haochuan Cemetery

Table 2. Assignments of absorption peaks in infrared spectra of five turquoise beads in Haochuan Cemetery

Table 3. Determination of chemical composition of five turquoise beads in Haochuan Cemetery