Comparative analysis of coatings on granitic substrates from urban and natural settings (NW Spain)

► This is the first comparative study of rock coatings on buildings and natural outcrops. ► Higher diversification of coatings on buildings exists due to extrinsic factors. ► Variable microclimatic agents on buildings favour the diversification of coatings. ► Weathering rates are briefly discussed, as the age of the studied surfaces is known. ► Weathering rates will depend on the surface, coating, timescale and climatic changes.