On zeophyllite from Radejčín, České středohoří Mts.
- Author(s)
- Werner Mikenda, Franz Pertlik, Pavel Povondra, Jaromír Ulrych
- Abstract
A redetn. of the crystal structure of zeophyllite, idealized Ca13Si10O28F10.6H2O [a = 9.377(2), c = 36.57(2) .ANG.; Z = 3], space group R.hivin.3 (No. 148) yielded R = 0.033 for 2238 obsd. single crystal X-ray data (Fo > 3sigmaFo). The at. coordinates in combination with the anisotropic thermal displacement parameters and the internal R-value from merging equiv. intensities gave no evidence for a violation of trigonal symmetry. The structure is characterized by SiO4 tetrahedra combined to open branched vierer single layers in an arrangement normal to the threefold axes. These layers are connected via the Ca(O,F)x polyhedra and hydrogen bridges to a framework with a pronounced cleavage parallel to (00.1). The statistic occurrence of Si-OH groups in parts of the structure was confirmed by IR-investigations.
- Organisation(s)
- Department of Mineralogy and Crystallography, Department of Organic Chemistry
- External organisation(s)
- Czech Academy of Sciences, Charles University Prague
- Journal
- Mineralogy and Petrology
- Volume
- 61
- Pages
- 199-209
- No. of pages
- 11
- ISSN
- 0930-0708
- DOI
- https://doi.org/10.1007/BF01172484
- Publication date
- 1997
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105113 Crystallography, 105116 Mineralogy, 104026 Spectroscopy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/f8f5b3da-b0f5-4796-bcab-d14b67b0147d