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On the conditions of the formation of cancrisilite Na7(Al5Si7O24)(CO3) · 3H2O and «hydroxycancrinite» Na6(Al6Si6O24) · 4H2O (on the basis of data on synthesis)
К вопросу об условиях образования канкрисилита Na7(Al5Si7O24)(CO3) · 3H2O и «гидроканкринита» Na6(Al6Si6O24) · 4H2O (на основе данных по синтезу)

Chukanov N.V., Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow Region, Russia, Kotel'nikov A.R., Pekov I.V., Van K.V., Faculty of Geology, Moscow State University, Moscow, Russia, Institute of Experimental Mineralogy RAS, Chernogolovka, Moscow Region, Russia, Faculty of Geology, Moscow State University, Moscow, Russia, Institute of Experimental Mineralogy RAS, Chernogolovka, Moscow Region, Russia
2019 Zapiski RMO (Proceedings of the Russian Mineralogical Society)  

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Синтезированы алюмосиликаты с канкринитовой структурой, по составу отвечающие высококремниевой разновидности канкрисилита и CO 3 -дефицитному аналогу канкринита. Эмпирические формулы полученных соединений -Na 6.13 [Al 4.36 Si 7.64 O 24 ](CO 3 ) 0.91 ·2.85H 2 O и Na 6.19 [Al 5.53 Si 6.47 O 24 ](CO 3 ) 0.37 ·3.92H 2 O соответственно. Оба образца охарактеризованы методами ИК-спектроскопии и порошковой рентгенографии. Обсуждаются условия образования канкрисилита и карбонат-дефицитного канкринита в
more » ... рироде. Сделан вывод о том, что кристаллизации канкрисилита способствуют надкритические условия и ультраагпаитовая обстановка. Ключевые слова: минералы группы канкринита, канкринит, канкрисилит, гидротермальный синтез, ИК-спектроскопия, порошковая рентгенография. Aluminosilicates with a cancrinite-type structure compositionally related to cancrisilite and a Ca-free and CO 3 -deficient cancrinite analogue were synthesized and characterized by electron microprobe and HCN-analyses, IR spectroscopy, and powder X-ray diffraction. The empirical formulae of the compounds obtained are H 0.05 Na 6.13 [Al 4.36 Si 7.64 O 24 ](CO 3 ) 0.91 ·2.85H 2 O and H 0.07 Na 6.19 [Al 5. 53 Si 6.47 O 24 ](CO 3 ) 0.365 ·3.915H 2 O, respectively. The latter compound is characterized by disordered chains (···Na···H 2 O) ∞ in the narrow channel and a high content of H 2 O in the wide channel. The conditions for the formation of cancrisilite and carbonate-deficient cancrinite varieties in nature are discussed. It was concluded that supercritical conditions and ultra-agpitic environment contribute to crystallization of cancrisilite.
doi:10.30695/zrmo/2019.1485.08 fatcat:vqveesclnffrjd5tc6ki4mez64
Citation

Chukanov N.V., Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow Region, Russia, Kotel'nikov A.R., Pekov I.V., Van K.V., Faculty of Geology, Moscow State University, Moscow, Russia, Institute of Experimental Mineralogy RAS, Chernogolovka, Moscow Region, Russia, Faculty of Geology, Moscow State University, Moscow, Russia, Institute of Experimental Mineralogy RAS, Chernogolovka, Moscow Region, Russia. "On the conditions of the formation of cancrisilite Na7(Al5Si7O24)(CO3) · 3H2O and «hydroxycancrinite» Na6(Al6Si6O24) · 4H2O (on the basis of data on synthesis)." Zapiski RMO (Proceedings of the Russian Mineralogical Society) 148.5 (2019) 135-144