The geological literature has long known examples of localization of bark complex rocks or hydrothermal veins in the fractures of shear-type discontinuities. Characteristically, all the examples of fracture formation associated with horizontal flexures described in the geologic literature necessarily reflect the conditions that arise during the development of large-scale shear faults.

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 ...