The crystal structure refinement of a natural mordenite
- 1 February 1986
- journal article
- research article
- Published by Walter de Gruyter GmbH in Zeitschrift für Kristallographie - Crystalline Materials
- Vol. 175 (3-4) , 249-256
- https://doi.org/10.1524/zkri.1986.175.3-4.249
Abstract
The crystal structure of natural mordenite from Elba (Italy) with chemical formula (Na1.49K2.80Mg0.04Ca2.05Sr0.05)(Al8.98Si39.13)O96· 29.07 H2O was refined in its hydrated form up to awRvalue of 5.2%. Systematic absences were consistent with theCmcmspace group but the asymmetry of the extraframework ions indicated as more probable the acentric subgroupCmc21. Consequently the atom O8 is no longer set on an inversion center and the T – O8 – T angle is not constrained to 180°. The Si/Al distribution is partially ordered, with an enrichment of Al in the tetrahedra of the four-membered ring. All Ca ions are localized in a eight-coordinated site; K ions alternate with water molecules in a six-coordinated site.Keywords
This publication has 11 references indexed in Scilit:
- Crystallographic faulting in the mordenite group zeolitesZeolites, 1985
- Redetermination of the crystal structure of Cr12P7Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1979
- Positions of cations and molecules in zeolites with the mordenite-type framework VI dehydrated barium mordeniteMaterials Research Bulletin, 1978
- Positions of cations and molecules in zeolites with the mordenite-type framework: III Rehydrated Ca-exchanged ptiloliteMaterials Research Bulletin, 1976
- The crystal chemistry of mordenitesContributions to Mineralogy and Petrology, 1975
- Framework Structures Related to the Zeolite MordenitePublished by American Chemical Society (ACS) ,1973
- Correction factors for electron probe microanalysis of silicates, oxides, carbonates, phosphates, and sulfatesAnalytical Chemistry, 1970
- Al–O and Si–O tetrahedral distances in aluminosilicate framework structuresActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1968
- An Empirical Method for Electron Microanalysis.Analytical Chemistry, 1964
- The crystal structure of mordenite (ptilolite)*Zeitschrift für Kristallographie, 1961