Examples of the most typical pegmatite veins of the North Baikal region, located in granitoid bodies and represented by combinations of converged different-structured zones, which have a rootless bar-shape of a certain spatial orientation of sizes, are considered. Prospective mica saturation is associated mainly with large-block (pegmatoid) zones, the separation of which from the "background" of other structures and the correct geometrization are of great practical importance.

The development of the material world is studied using the methods of evolutionist doctrine, which is widely used in various fields of knowledge, particularly in geology. Regressive branches of evolution have been analyzed much weaker, so there is no methodological basis for studying such processes, which does not allow us to establish regularities and predict the features of their course in the future. There is a need to create an adequate doctrine of the regressive state of matter, part of which will be the theory of regressive processes in the lithosphere and their role in the formation of mineral deposits.

The principles of separation of non-kinematic structures and their peculiarities of primary importance for prediction are established. Genetically, the appearance of such structures is connected with the dilatancy environment of the regressive stage of metamorphism or with similar conditions existing in intrusive complexes at postmagmatic stages of their development. The basis of mineralogical evolution of focal structures is determined and the question of specificity of oreogenesis for the crystalline environment at dilatency and stretching is considered.

Temporal and spatial periodicity of events and structural compositions is a law of the structure and evolution of the Earth as a material body.

Any minerals that make up rocks carry information about the tectonic conditions of crystallization and epigenetic stages of their development.

Within the Mamsko-Chuyskaya pegmatite province widely distributed bodies of giganto-migmatites, characterized by an exceptional variety of forms and complexity of internal structure.

A lot of data on the internal structure of pegmatite deposits of Kolotovka, Bolshoy Severny, Vitimskoye, Maximikha, Lugovka deposits have been accumulated in recent years. They allow to refer fine-grained biotite granites to independent structural varieties. It is expedient to consider some peculiarities of interrelations of these rocks with large-crystalline varieties of pegmatites and to supplement the existing data on the forms of transition of typical vein granites into rocks of pegmatite appearance ...

In the Mamsko-Chuyskaya mica province many deposits are confined to the bodies of the so-called giganto-migmatites, representing a system of layer-by-layer and secant pegmatite deposits, so they were studied by many geologists. One of the first researchers was N.V. Petrovskaya who called these bodies giganto-migmatites. In subsequent years, all geologists unanimously noted that more than half of the pegmatite varieties involved in the structure of giganto-migmatites are granitic rocks. They were named granite-pegmatites.