IR transmission spectra of hydrothermal argils, which are formed as a result of modern geothermal processes in the central part of the Nizhne-Koshelevsky deposits and Nizhne-Koshelevsky thermoanomaly, located in the south of the Kamchatka peninsula are investigated. <...> The state of water in mineral hydrothermal argils is characterized. <...> The characteristic bands of aluminosilicate structure are discerned. <...> On the basis of that one phase compositions of argils are considered. <...> Joswig W. The orientation of the hydroxyl groups in dickite by X-ray diffraction / W. Joswig, V. A. Drits // Neues Jahrbuch fuer Mineralogie. <...>