This article briefly describes the characteristic geological features of the phlogopite deposits of the Slyudyanskii and Aldanskii districts, which are of exceptional importance in the search for and development of industrial deposits of this raw material. Of particular interest in terms of exploration are the wallrock alterations in the host rocks, represented by unique metasomatic green diopside rocks, with which the phlogopite deposits are closely related genetically and territorially. Therefore, the example of phlogopite deposits clearly shows the most important role of wallrock alterations in the host rocks as a search feature. In this article, using the example of phlogopite deposits, the importance of the problem of studying various metasomatic wallrock alterations is emphasized. The article notes the most characteristic search features of phlogopite deposits. Leningrad, 1946.
