Structure of calcinaksite KNa[Ca(H2O)][Si4Ol0], the first hydrous member of the litidionite group of silicates with [Si8O20]8− tubes

Aksenov, S.M.; Rastsvetaeva, R.K.; Chukanov, N.V.; Kolitsch, U.

doi:10.1107/S2052520614012992

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 8
The crystal structure of agrellite Na(Ca,Sr)₂[Si₄O₁₀]F (a), heteropolyhedral layer of (Ca,Sr)O₅F octahedra and (Ca,Sr)O₆F₂ polyhedra in agrellite (b), and `hypothetical' octahedral layer in the crystal structure of calcinaksite, with dashed bonds representing the completion of the NaO₅ square pyramid to a distorted NaO₅Ø octahedron by considering the long Na—Ow distance of 2.938 (6) as a bonding distance (c).

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 70| Part 4| July 2014| Pages 768-775

doi:10.1107/S2052520614012992

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