Until now, a number of important general questions concerning the conditions of formation of quartz veins and crystal nests developed within the crustalenous fields remain to some extent debatable.

Over time, more and more examples of rational interpretation of ore field structures have been accumulated, which significantly helps further prospecting and exploration works. Over the last ten years, the intensified development of this problem has also begun in application to crustaleniferous fields. Undoubted progress has already been achieved for the fields of crystal-quartz veins (works by A. E. Karyakin, V. A. Smirnova and others in the Subpolar Urals). Deciphering of the structures of the fields of crustalene pegmatites has not yet been completed and there is no unanimous judgment on the methodological basis necessary for this ...