In recent years, rare-metal columbite-beryllite mineralization was discovered in pegmatite veins in one of the northwestern regions of the USSR. In the literature devoted to the description and genesis of rare-metal pegmatites, the results of studies of near-contact alteration of rocks hosting berylliferous and spodumene pegmatites have been published. In all these works, the genesis of pegmatites and the formation of near-contact changes in the host rocks are explained from the position of A. E. Fersman, who assumes the existence of a specific pegmatite melt.