Abstract
The chemical composition, IR spectroscopic characteristics, and crystal structure of the cancrinite group mineral with an afghanite-type framework, in which the \({\text{SO}}_{3}^{{2 - }}\) sulfite group is the dominant extraframework anion, have been investigated. The studied mineral is hexagonal, and the space group is P-62c. The unit cell parameters are a = 12.895(2), c = 21.276(4) Å, and V = 3063.8(11) Å3. A narrow channel consisting of cancrinite cages hosts the chains …(Na0.84Ca0.16)–[(H2O)0.75Cl0.23□0.02]–(Na0.70□0.30)–[(H2O)0.75Cl0.23□0.02] … The remaining extraframework components occupy columns consisting of alternating liottite and cancrinite cages. In particular, the liottite cage contains sulfate and sulfite groups, with the latter dominating. The high content of \({\text{SO}}_{3}^{{2 - }}\) groups and the low content of \({\text{SO}}_{4}^{{2 - }}\) groups are confirmed by the IR spectroscopy data. The studied mineral is the \({\text{SO}}_{3}^{{2 - }}\)-dominant analogue of alloriite. The crystal chemical formula Na2.53K2Ca2.73(Si6Al6O24)(SO3)0.5[(SO3)0.47](OH)0.99Cl0.30⋅0.85H2O (Z = 4) obtained as a result of structure refinement is close to the empirical one. The mechanisms of genesis of multilayer minerals of the cancrinite group are discussed.
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ACKNOWLEDGMENTS
We are grateful to R. Allori for the sample provided for study and to S.N. Britvin for helpful discussion.
Funding
This work was supported by the Russian Science Foundation, grant no. 18-29-12007_mk (the structural study, the crystal-chemical and mineral-genetic analysis). Chemical-composition and the IR-spectroscopic studies were performed with the framework of a state assignment, state registration no. AAAA-A19-119092390076-7.
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Chukanov, N.V., Zubkova, N.V., Pekov, I.V. et al. Sulfite Analogue of Alloriite from Sacrofano, Latium, Italy: Crystal Chemistry and Specific Features of Genesis. Geol. Ore Deposits 63, 793–804 (2021). https://doi.org/10.1134/S1075701521080043
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DOI: https://doi.org/10.1134/S1075701521080043