On the role of host rocks in the formation of some deposits of technical agate
Abstract
Endogenous deposits of technical agate are rare. Geologically they are poorly studied and many questions about conditions of their formation remain unclear. One of such questions concerns the problem of influence of host rocks on the process of formation of deposits of this type of mineral raw materials. Geologists who studied endogenous agate deposits usually note one side of the influence of host rocks: host rocks by virtue of lithological and textural features contributed to the deposition of chalcedony from hydrothermal solutions. At the same time, as a matter of course, it is assumed that the main mass of components, including silica, necessary for crystallization of chalcedony and accompanying minerals, hydrothermal solutions brought to the host rocks from the magmatic chamber.
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