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PL
The text brings attention to the role and significance of examination of rock material in the first stone buildings from the beginning of the Polish state, primarily in Poznań, Ostrów Lednicki, Gniezno, Giecz and Łekno. The most part of the text is devoted to gypsum, which, after a technological processing, was used as mortar. The natural bassets of gypsum and its waterless variety, i.e., anhydrite, can be found in the village of Wapno near Wągrowiec. It was in Wapno where this raw material was exploited and transported to construction sites. Still open remains the question of the way of transportation of this raw material from the village of Wapno to Poznań, Ostrów Lednicki, Gniezno, Giecz and Łekno.
PL
In the article I draw attention to the lack of consistency in descriptions of the rock material used to build the first structures in the early Piast state. The role and importance of the types of stone material used at that time are unappreciated, if not downright ignored. I emphasize the fact that the main material used in early-medieval building construction were glacial erratics, sometimes representing up to 98% of the entire building material. Other rocks used in constructing buildings included travertine, sod iron ore, limestone and  gypsum. However, I have devoted a lot of attention to the Miocene quartzite sandstone excavated in the early stages of Polish statehood from a quarry in Brzeźno near Konin. In the summary, I suggest possible time scales for the use of part of the rock material.
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