CAUSES OF DESTRUCTION OF ARCHITECTURAL DETAILS MADE OF ALABASTER STONE (FOR EXAMPLE, THE GOTHIC CHURCH IN DROHOBYCH)

. The article presents a detailed description of the conservation state of the unique gothic alabaster portal of the parish church in Drohobych. It also defines the position of the portal in the plan of the church. The main reasons and consequences of the deterioration of the alabaster stone are established. The article studies and supplements the historical background on the portal's foundation and the changes that arose during the reconstruction in the twentieth century. According to the results of the carried out researches (microanalysis, visual observation, comparison), this article establishes a deposit from which the stone was supplied for the construction of the portal. Microanalysis of the selected samples showed the alabaster’s structure and type, natural process of the dissolution of alabaster crystals, components of cement mortars.