The article presents the results of studies on the kinetics of grinding of granite taking into consideration the morphology and mechanical properties of particular size fractions of the feed. The study was conducted in a mill on a semi-technical scale. Milling was carried out periodically using several sets of grinding media. The output fraction of the ground material was of size 3-5 mm. The granulometric analysis of the raw material was carried out in a multiple manner. The granulometric composition of milling product was analyzed every 30 minutes. Simultaneously, ground material was subjected to an analysis of the shape of grains and microscopic analysis of morphology and chemical composition. Strength tests of grains were performed applying selected fractions of particle size ranges. The change of particle breakage rate function Si, for selected particles size ranges, was described with the Austin- Gardner expression. The influence of destructive force on kinetics of grinding was defined.