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Table 6 Chemical compositions of the marked positions in Fig. 7d and i (in wt%)

From: Corrosion of Longquan celadons in the marine environment: study on the celadons from the Dalian Island shipwreck of the Yuan Dynasty

Position No. Ratio Na2O MgO Al2O3 SiO2 P2O5 K2O CaO Fe2O3 Possible phase
P1 wt%   3.36 14.43 62.42   5.53 14.25   Glass
mol%   5.33 8.97 65.87   3.72 16.11  
P2 wt% 1.25 2.17 26.30 47.19   2.26 20.83   Anorthite
mol% 1.33 3.59 17.04 51.91   1.59 24.54  
P3 wt%    3.94 13.60 32.15   50.31   Calcium phosphate
mol%    2.78 16.30 64.60   16.31  
P4 wt%   38.91 38.31 18.27     4.51 Quintinite
mol%   57.88 22.35 18.09     1.68