Weathering

Weathering is a complex interaction of physical, chemical and biological processes that
alters the stone in some general or specific way.

The physical properties of stone differs widely between stone groups and even within
the same stone type. The mineral composition, textural differences, varying degrees of
hardness and pore/capillary structure are the main reasons why stone nor all the surface
of the same stone shows signs of alteration the same and evenly.