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Table 4 EPMA microanalysis data performed on several areas of the white tesserae sample

From: Novel characterization techniques for cultural heritage using a TEM orientation imaging in combination with 3D precession diffraction tomography: a case study of green and white ancient Roman glass tesserae

White Diameter SiO2 Al2O3 CaO SnO2 K2O Na2O MgO TiO2 MnO FeO CoO CuO SO3 PbO Cl Sb2O5 Total
1 > 1 μm 56.14 1.73 5.35 0.06 0.33 5.50 0.41 0.07 0.56 1.59 0.00 0.03 0.19 17.25 0.93 1.00 91.14
2 > 1 μm 54.08 4.24 6.45 0.12 0.52 7.97 0.66 0.07 0.28 1.70 0.00 0.00 0.27 0.00 0.38 17.20 93.94
3 > 1 μm 22.09 4.37 8.52 0.24 0.51 4.92 0.28 0.00 0.08 1.94 0.01 0.00 0.31 0.04 0.18 48.44 91.92
4 < 1 μm 70.16 2.64 7.33 0.00 0.43 9.68 0.76 0.10 0.70 0.55 0.01 0.01 0.34 0.10 0.86 2.99 96.65
5 < 1 μm 66.73 2.59 7.57 0.03 0.44 9.71 0.72 0.05 0.65 0.58 0.00 0.00 0.35 0.00 0.85 3.62 93.89
6 Glass 69.94 2.66 7.24 0.05 0.41 10.20 0.73 0.08 0.65 0.58 0.00 0.01 0.30 0.01 0.88 2.46 96.19
7 Glass 70.73 2.63 7.30 0.05 0.43 10.23 0.75 0.08 0.64 0.57 0.00 0.02 0.35 0.08 0.86 2.56 97.28
8 Glass 70.02 2.68 7.40 0.00 0.44 9.99 0.75 0.06 0.64 0.58 0.01 0.01 0.29 0.06 0.86 2.40 96.20
9 Glass 70.77 2.70 7.48 0.00 0.44 10.27 0.72 0.07 0.65 0.58 0.01 0.01 0.31 0.03 0.86 3.06 97.95
10 Glass 70.53 2.65 7.38 0.04 0.44 10.17 0.75 0.06 0.63 0.57 0.01 0.00 0.30 0.00 0.85 2.68 97.07
Average pigment comp. 53.84 3.11 7.04 0.09 0.45 7.56 0.57 0.06 0.45 1.27 0.01 0.01 0.29 3.48 0.64 14.65 93.51
Average glaze comp. 70.40 2.66 7.36 0.03 0.43 10.17 0.74 0.07 0.64 0.57 0.01 0.01 0.31 0.04 0.86 2.63 96.94
  1. Elemental composition obtained by means of EPMA in wt% on white tesserae. Typical analyzed areas are shown in Additional file 1: Fig. S5