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Table 3 Analyses performed on tesserae from the mosaic on the front of the San Giovenale chapel (Narni)

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

  Colour Description XRF ITNAA
1 blue-green transparent *  
2 blue-green transparent *  
3 blue-green transparent *  
4 blue-green transparent *  
5 blue-green transparent *  
6 light blue translucent *  
7 light blue translucent *  
8 light blue translucent *  
9 light blue translucent *  
10 light blue translucent *  
11 dark blue opaque *  
12 black obsidian * *
13 black obsidian *  
14 black obsidian * *
15 white limestone *  
16 colourless transparent *  
17 colourless transparent *