On the space group of garronite. [61. 10. Bp. 3; 61. 10. Bp. 6; 07. 85. Yy; 61. 66. Va. 5; 61. 66. Rm. 1]
- Dipartimento di Scienze della Terra, Universita di Milano, via Botticelli 23, I 20133 Milano (Italy)
The crystal structure of the natural zeolite garronite from Goble, Oregon has been refined using high resolution synchrotron X-ray powder diffraction data. Garronite has the same tetrahedral aluminosilicate framework as gismondine [GIS], and earlier structural models indicated a strong tetragonal pseudosymmetry. Proposed models in the literature were based on the I[bar 4]m2 and I4[sub 1]/a space groups, on account of symmetry lowering from the topological I4[sub 1]/amd space due to partial cation/water molecule order in the zeolitic cavities. Test structure analysis has been performed in all possible space subgroups including monoclinic space groups, and the refinement has been successfully carried out in space group I2/a (C2/c). The resulting monoclinic structure model is to be preferred over the tetragonal ones on the basis of: (1) lower agreement indices of the refinement; (2) a chemically sound framework geometry; and (3) a more satisfactory interpretation of the Ca atoms coordination in the extraframework cages. [copyright] [ital 1999 International Centre for Diffraction Data.]
- OSTI ID:
- 6441108
- Journal Information:
- Powder Diffraction, Vol. 14:3; ISSN 0885-7156
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM COMPOUNDS
CRYSTAL STRUCTURE
MINERALS
NSLS
POWDERS
SPACE GROUPS
SYNCHROTRON RADIATION
X-RAY DIFFRACTION
ZEOLITES
ACCELERATORS
ALKALINE EARTH METAL COMPOUNDS
BREMSSTRAHLUNG
COHERENT SCATTERING
CYCLIC ACCELERATORS
DIFFRACTION
ELECTROMAGNETIC RADIATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
RADIATION SOURCES
RADIATIONS
SCATTERING
SILICATE MINERALS
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
360602* - Other Materials- Structure & Phase Studies