We are delighted to have the chance to present a new volume of Archaeologia Polona, dedicated to the characteristics and distribution of siliceous rocks in prehistory. The papers that are published here were mostly presented in their initial form at conferences held in the Institute of Archaeology and Ethnology Polish Academy of Sciences in Warsaw on December 2016, May 2017 and in Vilnius in September 2016. (...) The present volume is opened by two papers concerning the distribution and use of siliceous rocks in the Palaeolithic. The next group of papers deals with ‘chocolate’ flint – its characterization and pres-ence in site assemblages. Subsequent papers contribute to the discussion of the role of ‘chocolate’ flint in lithic processing during the Mesolithic and Neolithic in present-day Poland. The next two papers present the procurement and distribution of non- and siliceous rocks within Stone Age communities. [From Editorial]