Volume contains abstracts of the international scientific conference «Fedorov Session 2010». The aim of the Fedorov Session 2010 is to discuss recent progress and future trends in crystallography, mineralogy and petrography within the frame of directions established in the works of Prof. Evgraf Fedorov (1853-1919). Scientific sessions: real structure of minerals and rocks: insight in formation processes; mineralogical crystallography and crystal chemistry; history of mineralogy, crystallography and petrology.