The crystal structure of Elba dachiardite [12414-93-6] shows an unusual rotation of 2 tetrahedrons around 1 edge. This rotation gives rise to 2 configurations which have the same frequency, thus maintaining the statistical symmetry C2/m. The most probable distribution of ions indicates the presence of 2 cation sites and 5 water mols. One cation site is at the crossing of the 2 systems of channels and is 8-fold coordinated, the other is in the channel parallel to c and is 2-fold coordinated. The extra framework sites are not affected by the rotation within the framework, coordinating only the fixed framework O atoms.
A refinement of Elba dachiardite: Opposite acentric domains simulating a centric structure / Vezzalini, Maria Giovanna. - In: ZEITSCHRIFT FUR KRISTALLOGRAPHIE. - ISSN 0044-2968. - STAMPA. - 166:(1984), pp. 63-71.
A refinement of Elba dachiardite: Opposite acentric domains simulating a centric structure
VEZZALINI, Maria Giovanna
1984
Abstract
The crystal structure of Elba dachiardite [12414-93-6] shows an unusual rotation of 2 tetrahedrons around 1 edge. This rotation gives rise to 2 configurations which have the same frequency, thus maintaining the statistical symmetry C2/m. The most probable distribution of ions indicates the presence of 2 cation sites and 5 water mols. One cation site is at the crossing of the 2 systems of channels and is 8-fold coordinated, the other is in the channel parallel to c and is 2-fold coordinated. The extra framework sites are not affected by the rotation within the framework, coordinating only the fixed framework O atoms.
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