Fig. 11: SEM-BSE image and corresponding ToF-SIMS maps of the Dobkowice sample.

The chemical maps show that the principal alteration layer (SL#1) is enriched in H, Si, Ca, and just slightly in Mg, whereas Na and K are depleted. Arrows demarcate the SL#1-bulk glass interface. The thin outer rim (SL#2) is enriched in Al and K. The prominent crack is an artefact.