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The modular structure of dovyrenite, Ca6Zr[Si2O7]2(OH)4: Alternate stacking of tobermorite and rosenbuschite-like units by M. Kadiyski; T. Armbruster; E. V. Galuskin; N. N. Pertsev; A. E. Zadov; I. O. Galuskina; R. Wrzalik; P. Dzierzanowski; E. V. Kislov is a scholarly article available to read on EtoBox.

What is The modular structure of dovyrenite, Ca6Zr[Si2O7]2(OH)4: Alternate stacking of tobermorite and rosenbuschite-like units about?

The average structure, space group Pnnm [subcell: A = 5.666( 16), B = 18.844(5), C = 3.728(11) Å, V = 398.0(2) Å 3 , Z = 1], of the new mineral dovyrenite Ca 6 Zr[Si 2 O 7 ] 2 (OH) 4 has been refined from single-crystal X-ray data to R = 7.97%. The modular structure of dovyrenite is build by alternate stacking of Ca-polyhedral layers characteristic of the tobermorite structure and octahedral layers with attached disilicate groups known from the rosenbuschite group of minerals. No indications of ordered polytypes were detected for the potential OD-structure. Either the small crystal size producing only weak diffraction intensities did not allow detecting diffuse diffraction features (or "super-structure" reflections) or the structure is build by disordered stacks of OD layers. Nevertheless, the resolved average structure allowed unraveling the possible order patterns within the rosenbuschite-like octahedral layers. The key for understanding the polytypic character of this structure is the short periodicity of the tobermorite-like Ca polyhedral layer of only 3.73 Å along c, whereas the periodicity of the attached rosenbuschite-like octahedral layer is doubled. In dovyrenite Ca occurs

Author

M. Kadiyski; T. Armbruster; E. V. Galuskin; N. N. Pertsev; A. E. Zadov; I. O. Galuskina; R. Wrzalik; P. Dzierzanowski; E. V. Kislov

Publisher

Mineralogical Society of America

Published

2008

Language

EN