Deposits of rock crystal in the Subpolar Urals were discovered in the thirties, when exploration work with the purpose of finding primary sources was based on the findings of surface placers of quartz crystals. Later, the main attention of geologists who studied and explored rock crystal deposits was directed to the study of conditions of formation and regularities of location of crystal bodies. Great progress has been made in solving this problem, and at present a considerable number of indirect signs have been established that indicate the possibility of finding blind nests of rock crystal in a given area.