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Table 2 Chemical compositions of inclusive phases in the Nanhai I shipwreck beads

From: Characterization of glass beads from Nanhai I shipwreck and new evidence of lead tin yellow type II in China

 

PbO

SiO2

SnO2

K2O

Na2O

Al2O3

Cu2O

Pb-Sn-Si phase in the yellow bead

68.36

13.49

16.32

1.27

0.26

0.29

–

K-Sn-Si phase in the yellow bead

11.21

38.16

30.28

20.28

–

0.08

–

Matrix of the yellow beads

63.56

30.86

1.75

3.3

0.32

0.21

–

K-Sn-Si phase in the orange-red bead

12.69

42.57

23.88

19.63

–

–

1.24

Cu2O particle in the orange-red bead

20.12

6.62

4.72

1.13

–

0.22

67.18

Matrix of the orange-red bead

45.80

36.06

0.06

6.80

0.68

0.28

10.31