  In this interdisciplinary paper, we study the formation of iron precipitates
- the so-called Liesegang rings - in Lecce stones in contact with iron source.
These phenomena are responsible of exterior damages of lapideous artifacts, but
also in the weakening of their structure. They originate in presence of water,
determining the flow of carbonate compunds mixing with the iron ions and then,
after a sequence of reactions and precipitation, leading to the formation of
Liesegang rings. In order to model these phenomena observed in situ and in
laboratory experiments, we propose a modification of the classical
Keller-Rubinow model and show the results obtained with some numerical
simulations, in comparison with the experimental tests. Our model is of
interest for a better understanding of damage processes in monumental stones.
