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M. Pasero, Stefano Merlino, O. Ferro

The crystal structure of kukisvumite, Na₆ZnTi₄(Si₂O₆)₄O₄ · 4H₂O

The crystal structure of kukisvumite, a rare mineral from Kola peninsula, Russia, has been refined in the Pccn space group with X-ray single-crystal data to R = 0.055. Kukisvumite, ideally Na₆ZnTi₄(Si₂O₆)₄O₄.4H₂O, has a = 29.029(4) Å, b = 8.595(1) Å, c = 5.209(1) Å, and Z = 2. Its crystal structure is closely related to that of lintisite; the latter mineral is obtained from kukisvumite through the substitution Zn²⁺ ∀ = 2 Li⁺. In the Pccn space group an average structural model is realized, resulting in columns of half-occupied [ZnO₄] tetrahedra and in zig-zag chains of half-occupied Na-centered octahedra. The actual structure of kukisvumite would imply a concerted ordering of zinc and sodium in neighbour cells. The polysomatic relationships of kukisvumite with the minerals of the lintisite family are shortly outlined.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 215, 06/2000
Pages: 352

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