Fig. 1. Photos of representative samples
(a), (b), (d), (e), (h): Unearthed serpentine jades; (c), (f): Taishan jade materials; (g): Unearthed ancient jade, 50×(reflected light); (i): Microphoto of magnetite in Taishan serpentine jade by reflected light

Fig. 2. Infrared spectra of serpentine jade unearthed from Dawenkou culture (p-FTIR)
(a): Ultrabasic type serpentine jades unearthed from Dawenkou site; (b): Dolomite type serpentine jade unearthed from Dawenkou culture;(c): Ultrabasic type serpentine Jades unearthed from the other Dawenkou culture sites; (d): Taishan jades

Fig. 3. Distribution of Cr-Cr/Ni values of serpentine jade from different producing (The data source is consistent with table 3 )

Fig. 4. The position of unearthed serpentine jade and Taishan jade mine
4: Yedian site at Zou county; 5: Dawenkou site in Taian city;13: Lingyanghe site at Jv county; 14: Dazhucun site at Jv county;21: Donghaiyu site in Rizhao city

Table 1. Characteristic description of serpentine jade unearthed from Dawenkou Culture

Table 2. p-XRF results of major and trace elements in serpentine jades unearthed from Dawenkou culture(major element: Wt%; trace element: μg·g^-1)

Table 3. Nondestructive and destructive test results of Cr, Ni and Cr/Ni value in serpentine jade from different habitats (μg·g^-1)