The Grodziec castle near Zlotoryja in Lower Silesia region, is mainly built of dark gray basaltic blocks, when the ornamental pieces (portals, window frames) are made of upper Cretaceous cut sandstone. These main lithological types are strongly different in weathering resistance and are influenced by different deterioration processes. The most important are weathering forms belonging to the group of loss of the stone material. Regarding sandstone loss of material, it is mostly caused by men. In basalts, the loss of material is caused by selective weathering and structure of the rock. In the group of discolorations and efflorescences, the most important are atmospheric dust and sooth precipitation - mainly on sandstones outer parts. In the consequence of fire in the year 1945 (during the 2nd World War), within the some burnt sandstones, the color changed into brown reddish, the mineral content changed and the porosity increased. The castle was restored, and now it is mostly in good condition, however it is still liable to suffer anthropogenic deterioration.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
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