We determined an isomorphic group of compounds with common formula K3Cu3(Fe3+, Al)O2(SO4)4 in products from fumarole activity of the Great Tolbatchik Fissure Eruption (GTFE, Kamchatka, 1975-1976). Within the isomorphic group, based on Fe and Al concentration we distinguished members on both sides of nominal 50 mol.% border. This fact along with variations in typical and diagnostically important physical characteristics of minerals was a factor for us to divide the group into two mineral species. Fe-members we called as "klyuchevskite", while Al-members were called as "alumoklyuchevskite". The latter is an aluminum analogue of klyuchevskite, compared to which Al is predominantly placed in Fe3+ positions.

Монография посвящена изучению современных ледников и снежного покрова Камчатки, особенно районов Авачинской и Ключевской групп вулканов. Выявлены специфические черты морфологии, режима и строения этих ледниковых толщ. Рассмотрены формирование рельефа Камчатки, ее климатические условия, морфологические типы и основные черты ледников. Исследовано влияние вулканизма на снежный покров.

Среди разнообразных явлений природы вулканическая деятельность во все времена особо привлекала внимание человека. Мощные, величественные, порой мрачные, иногда грозные, но всегда прекрасные, а в древности мало или совсем непонятные картины вулканических извержений производили на людей всегда сильное впечатление. И неудивительно поэтому, что деятельность вулканов вызывала в человеке, с одной стороны, безотчетную тревогу, а с другой — поэтическое восхищение.
Люди различно воспринимают деятельность вулканов. Одни видят в них величественные и грозные явления природы, другие интересуются ими с точки зрения внешней красоты проявления внутренних сил земли, третьих поражает мощь вулканических сил, а четвертые стремятся разобраться во всех вулканических явлениях и выявить причины их— познать их.

Kamchatka is a volcanic region of great interest.
About 100.000 km2 are covered by recent and quaternary lavas and tuffs; there are 20 volcanoes, active and solfatoric, 109 extinct volcanoes, 68 groups of thermal springs, 17 large and many small geysers. The Klyuchevskoy volcano is the most active one with a most varied volcanic activity. Besides, it is situated at the juncture of the Kourilsk-Kamchatka and Aleutian volcanic and tectonic arcs.
This fact explains for the organization of a volcanological station in the vicinity of the Klyuchevskoy volcano.
Since the station has been in existence, i. e, sinece 1935 the following eruptions have been recorded: the explosive eruption of the Klyuchevskoy volcano in 1935, and with lava flows from April 1937 till March 1939, and with formation of a number of parasitic craters; the eruption of Avacha from March till December 1938 accompanied by the issuing of an incandescent agglomerate stream rather the kind of the avalanche of the La Soufriere, the Merapi and partly the Mont Pele; the eruption of the Ploskij Tolbachik from September 1939 till June 1941, at the end of which a parasitic cone was formed from which flows issued; a small explosion of the Zhupanov volcano in the beginning of 1940; an eruption of the Karim volcano during 1940 and in the beginning of 1943.
Owing to the almost simultaneous ejection of lava at different heigtsts and at different distances from the central conduite of the Kluchevskoy volcano S. I. Naboko could drawn a picture of the gravitative differentiation in the magmatic reservoir.
There are given temperatures of the flowing bazaltic lava taken by V. P. Popkov and I. Z. Ivanov during their remarkable drift on the crust of the lava stream as well as the composition of gases collected by them from the hot lava.
A number of other volcanological observations is also given as well as short description of the volcanological station.
The Kamchatka Station was organized by F. I. Loevinson-Lessing. Since 1940 the station has been run by A. N. Zavaritsky, who is now organizing a Laboratory of Volcanology in Moscow.

"Каталог действующих вулканов Камчатки" является сводкой наших знаний на 1 января 1957 г. по действующим вулканам Камчатки.