Gabbro and basalt are mafic igneous rocks which have generally the same mineral composition, because they crystallize from a similar type of solution. This solution is not saturated by silica. Basalt is an effusive equivalent of gabbro. The different genesis of these rocks causes their textural differences which influence properties of gabbro and basalt aggregates. In this article the analysis of the properties of gabbro and basalt aggregates made from raw materials from chosen deposits in Poland is presented. Compositions and comparisons of these properties is also done. The special attention is paid to occuring differences which are essential for utilization of these aggregates in the building industry.