Chukanov N. V., Kotel’nikov A. R., Pekov I. V., Van K. V.

To the question about conditions of the mineral-forming of cancrisilite Na₇(Al₅Si₇O₂₄)(CO₃)·3H₂O and “hydrocancrinite” Na₆(Al₆Si₆O₂₄)·4H₂O (on the base of data of their synthesis)

Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2019. V. 148. N 5. P. 135-144

https://doi.org/10.30695/zrmo/2019.1485.08

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Language: Russian

Abstract

Aluminosilicates with a cancrinite-type structure compositionally related to cancrisilite and a Ca-free and CO₃ — 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_0.05Na_6.13[Al_4.36Si_7.64O₂₄](CO₃)_0.91 · 2.85H₂O and H_0.07Na_6.19[Al_5.53Si_6.47O₂₄]·(CO₃)_0.365 · 3.915H₂O, respectively. The latter compound is characterized by disordered chains (···Na···H₂O)_∞ in the narrow channel and a high content of H₂O 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.

Key words: cancrinite-group minerals, cancrinite, cancrisilite, hydrothermal synthesis, IR spectroscopy, powder X-ray diffraction

Chukanov N. V., Kotel’nikov A. R., Pekov I. V., Van K. V.

To the question about conditions of the mineral-forming of cancrisilite Na7(Al5Si7O24)(CO3)·3H2O and “hydrocancrinite” Na6(Al6Si6O24)·4H2O (on the base of data of their synthesis)

Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2019. V. 148. N 5. P. 135-144

https://doi.org/10.30695/zrmo/2019.1485.08

Abstract

To the question about conditions of the mineral-forming of cancrisilite Na₇(Al₅Si₇O₂₄)(CO₃)·3H₂O and “hydrocancrinite” Na₆(Al₆Si₆O₂₄)·4H₂O (on the base of data of their synthesis)