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Table 1 XRF results expressed as cps (tr: trace)

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

# Colour K Ca Mn Fe Co Cu Pb Sr Y Zr Nb Sn Sb Ba La Ce
1 blue-green   8.2 11 40   154 13      15 125 4.2   
2 blue-green   8.7 10 36   141 11 0.43     17 137 4.9   
3 blue-green   8.5 11 43   161 13 0.57     11 101 3.3   
4 blue-green   6.7 9.2 34   127 8.7 0.29     15 122 4.4   
5 blue-green   6.4 8.2 30   121 11 tr     13 111 3.9   
6 light blue   12 11 35   132 2.3 0.51     16 165 4.7   
7 light blue   6.5 15 40   36 1.4 tr     3.2 48 2.6   
8 light blue   11 7.5 36   194 4.2 0.48     18 141 3.4   
9 light blue   5.4 4.3 19   106 1.9 0.39     12 119 3.2   
10 light blue   7.3 8.2 30   161 3.3 0.47     17 171 3.7   
11 dark blue   10 21 49 5.4 18 5.0 0.41     5.1 176 5.3   
12 black 2.9 2.1 2.8 134      0.19 1.0 0.29    29 0.90 4.3
13 black 3.6 2.3   147      0.15 1.1 0.34    22 0.70 3.0
14 black 1.9 2.0   86      0.22 0.81 tr    27 0.71 3.8
15 white   120 0.36 2.0             
16 colourless   20 8.7 23     0.53     tr 53 4.0   
17 colourless   14 11 27     0.53      74 5.6