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.