By the priority parameters unders conditions of the up-to-date market – decorative properties and the output of blocks – the geological-recoverable types of the facing stone deposits are selected among known ones on Karelian Isthmus. There are indicated parameters most important for geologic-economical estimation of those deposits, and made for methods of geological-exploration work, with examples of using the facing stones from currently mined deposits.
The peculiarities of are considered in terms of mica-bearing pegmatites of the Karelian, Kola and Mama and Vitim mica-bearing provinces and chamber pegmatites of Central Kazakhstan. Special attention is paid to the influence of physical and mechanical properties of enclosing rock on the shape and occurrence of pegmatite bodies and their association with post-folded faults.
The prerequisites for the development of the deposits, the previous studies and the current state of Karelian Isthmus facing stone sources as well as their comparison with those of other regions of Northwestern Federal Districts of Russia are considered. The objects for top-priority geological prospecting are determined.