The leading role of discontinuous and fracture tectonics in localization and location of piezoquartz deposits in the territory of the crystal province of the Subpolar Urals, as well as ore bodies - crystal nests - within the deposits, has been repeatedly noted by researchers...

The considered article by P. B. Vainerman and A. S. Smirnova, in our opinion, insufficiently objectively, and in some cases geologically incorrectly reflects some questions of conditions of formation and regularities of location of Transcaucasian deposits of technical agate. In this regard, we consider it necessary to discuss these iss.s in order to exclude subjective and poorly grounded ideas, which can misdirect researchers ...