Domieszki skał talkowych w naczyniach kultury ceramiki wstęgowej kłutej z Dolnego Śląska – wstępne wyniki

Talcose rock used in tempering Stroked Pottery Culture vessel finds from several sites in Lower Silesia was identified in the past incorrectly as gypsum or anhydrite (Kulczycka-Leciejewiczowa 1981, p. 33). Talc is a mineral with a low thermal expansion coefficient; it was often added to pottery to increase its thermal shock resistance (Rice 1987, p. 105-106). The petrographic analysis focused on four pottery samples originating from sites Gniechowice 8 (samples GNC1 and GNC2) and Niemcza 4 (samples NMZ1 and NMZ2). The scope of analysis included: thin section studies, XRD analysis, thermal analysis. Petrographic features distinctive for talcose rock were present in all the analysed samples (relics of antigorite and rusty brown frayed (?) aggregates of chlorite) and indicate a common source of the tempering material, possibly an outcrop of ultramaphic rock found in the Hills of Gilów or in the Mount Slęża Massif.