EFFECT OF THE COMPOSITION OF ZEOLITE PARANATROLITE ON THE CONFIGURATION OF ITS WATER-CATION SUBSYSTEM
Yu. V. Seryotkin1,2, V. V. Bakakin3, I. V. Pekov4
1Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academic of Sciences, Novosibirsk, Russia
2Novosibirsk National Research State University, Novosibirsk, Russia
3Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
4Geology Department, Moscow State University, Moscow, Russia
Keywords: цеолиты, паранатролит, кристаллическая структура, водно-катионные ассоциаты, zeolites, paranatrolite, crystal structure, water-cation assemblages
Abstract
The Rietveld method is used to determine the structure of two samples of high-hydrated zeolite paranatrolite: {Na1.15Ca0.38Sr0.04(H2O)3.1}[Al2.19Si2.81O10] (Vishnevye Mountains, Urals) and {Na2.01K0.04H0.04(H2O)3.8}[Al2.10Si2.90O10] (Kirov Mine, Khibiny Massif). Paranatrolite from the Vishnevye Mountains is characterized by the presence of split water positions and a relatively low total H2O content. Local water-cation assemblages (WCAs) of three configurations are identified in the statistical “mixture”. The extraframework subsystem in the structure of Khibiny paranatrolite is made of WCAs of one configuration. The H2O content of this mineral is close to the maximum possible amount and is a record-breaker for natrolite-type minerals.
|
