Table 4: Isotopic and chemical composition of Roman and late Antique glasses from Thessaloniki, 1st–6th centuries AD in age. Samples with moderate and strong 18O enrichment are in italics and bold font, respectively. Note that NiO, ZnO, and SnO2 contents are not reported because they are lower than EMPA detection limits for all samples (LOD of NiO = 0.03 wt%; LOD of ZnO and SnO2 = 0.04 wt%).

Sample18OSiO2Na2OCaOAl2O3K2OMgOFeOTiO2MnOP2O5SO3ClCoOCuOSb2O3PbO
Number(VSMOW)Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%

1-322.667.4613.009.741.174.852.010.580.060.960.690.071.28<0.03<0.03<0.04<0.08
2-322.567.3113.209.801.154.772.000.570.050.960.660.071.29<0.03<0.03<0.04<0.08
3-318.666.9519.466.712.210.430.960.630.101.270.100.251.43<0.03<0.03<0.04<0.08
4-315.864.2017.677.022.850.401.282.120.372.650.100.401.23<0.03<0.03<0.04<0.08
5-315.667.8916.178.642.680.530.830.440.071.360.070.351.19<0.03<0.03<0.04<0.08
6-317.364.9219.198.212.320.591.060.940.141.580.070.450.87<0.03<0.03<0.04<0.08
7-315.271.6215.536.472.630.650.420.260.040.330.090.031.06<0.03<0.03<0.04<0.08
3-416.164.7818.627.752.370.591.191.150.151.520.050.440.93<0.03<0.03<0.04<0.08
4-415.367.3216.967.852.520.310.880.720.221.610.010.281.36<0.03<0.03<0.04<0.08
5-415.366.7817.966.522.400.500.950.790.211.660.020.291.19<0.03<0.03<0.04<0.08
6-415.365.2517.467.832.460.621.000.800.151.920.050.470.99<0.03<0.030.04<0.08
7-415.365.8018.766.301.890.540.870.670.100.770.040.311.46<0.031.78<0.04<0.08
8-415.661.5612.4810.033.904.951.930.790.170.730.430.140.88<0.03<0.030.040.50
9-422.767.809.809.211.105.452.350.510.050.670.520.100.91<0.03<0.030.04<0.08
10-416.465.4619.836.362.480.491.161.170.160.110.010.521.230.040.21<0.040.63
11-415.464.5117.918.642.650.761.181.430.140.660.110.450.98<0.03<0.03<0.04<0.08
12-420.562.7211.799.451.344.402.040.920.064.380.390.131.05<0.03<0.030.06<0.08
13-417.364.4412.689.642.344.232.070.760.121.210.420.161.01<0.03<0.030.040.14
14-415.664.4817.817.232.580.791.341.970.151.150.140.540.98<0.03<0.03<0.04<0.08