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Table 2 Trace element composition (in ppm) of obsidian samples (SA: Sardinia site A; SC: Sardinia site C;) investigated and used for identifying the provenience of the two obsidian tesserae (samples 12 and 14)

From: Obsidian use in the mosaic of the St. Juvenal church, Narni (Italy): chemical characterization and origin

  14 12 SA SA SA SA SA SA SC SC SC SC SC SC Lipari Lipari Lipari Lipari Lipari Lipari Lipari Lipari Lipari
Na % 3.04 3.11 2.64 2.91 2.29 2.33 2.42 2.775 2.26 2.66 1.94 2.10 2.46 2.37 2.84 3.19 2.39 2.29 2.68 1.87 2.51 2.96 3.41
Sc 3.51 3.47 4.2 4.7 4.51 4.31 5.23 4.45 3.55 4.05 2.7 3.06 3.8 3.88 1.18 1.3 0.95 0.92 1.09 1.42 1.23 1.33 1.43
Fe % 1.97 2.01 0.87 1.07 0.95 0.88 1.08 0.97 1.29 1.46 0.92 0.99 1.375 1.27 1.37 1.57 0.86 0.84 1.16 0.92 1.36 1.445 1.53
Zn 92.2 93.1    66.6 62 67.2     46 49   54    54.5 53.7   58.4    
Sb 0.47 0.55    0.05 0.17 0.19     0.04    0.15    0.94 0.97   1.11    
La 34.4 34.7 22.2 24.5 22.9 21.1 20.9 23.35 60.4 66.8 56 56 63.6 62.2 57 66 49.7 53.6 56.6 50.6 55 64 73
Ce 135 138 46 56 58.2 50.6 62.6 51 120 170 0.78 0.67 145 0.83 110 160 95.5 100.9 116.6 102.2 130 150 170
Nd 45 51    18.7 17.3 14.8     34.3 26.3   16.1    16.7 22.4   21.9    
Sm 9.82 9.78 5.5 6.1 5.12 4.85 5.32 5.8 6.5 8 6.42 6.41 7.25 7.49 6.8 7.7 5.24 5.94 6.42 5.72 7.2 7.95 8.7
Eu 1.69 1.66 0.2 0.6 0.35 0.32 0.35 0.4 1.2 1.4 0.86 0.81 1.3 1.02 0.1 0.2 0.08 0.09 0.118 0.09 0.1 0.15 0.2
Tb 0.96 0.93     0.63 0.72      0.57   0.61    0.53 0.76   0.67    
Yb 10.9 10.6     0.04 0.05      0.02   0.03    0.05 0.05   0.05    
Rb 129.7 129.2    229 201 245     95.4 120.5   149.7    221 217   228    
Cs 1.64 1.60 3.7 4.6 4.25 3.72 4.67 4.15 2 2.8 1.42 1.7 2.4 2.02 16.5 20.2 15 15.7 16.8 15.4 17.7 18.85 20
Ba 506 610    287 132 216      621   823    1436 1285   3813    
Hf 16.5 16.1 3.1 4.1   3.85 2.77 3.6 6 8.2   6.26 7.1 8.11 5.9 9.3 6.84 7.18 7.30 7.13 5.7 7.55 9.4
U 3.88 3.80 17 17 3.38 2.55 2.61 17 1 3.2 1.42 1.12 2.1 1.67 23 24 4.96 6.09 14.5 5.66 15 20 25
Th 13.1 12.7 16 21   12.3 15.2 18.5 30 39   16.4 34.5 21.4 42 63 36.7 37.5 44.8 36.9 54 64 74
Ta 8.13 8.26     2.77 3.43      1.27   1.63    1.46 1.5   1.5