The crystal structure of aklimaite, Ca4[Si2O5(OH)2](OH)4 · 5 H2O
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Natalia V. Zubkova
Abstract
Aklimaite, Ca4[Si2O5(OH)2](OH)4 · 5 H2O, is monoclinic, space group C2/m, a = 16.907(5), b = 3.6528(8), c = 13.068(4) Å, β = 117.25(4)°, V = 717.5(4) Å3, Z = 2. The crystal structure was solved by direct methods and refined to R(F) = 0.1100 for 1196 unique reflections with I > 2σ(I). Aklimaite is a sorosilicate of a new structure type. The structure is based on corrugated layers of Ca-centered polyhedra formed by alternating columns of edge-sharing Ca octahedra and seven-coordinated polyhedra, extending along [010] which are connected with Ca seven-coordinated polyhedra of another type via common edges. Si-centered tetrahedra form isolated Si2O5(OH)2 groups which are combined in a motif like interrupted chains (“dotted lines”) sharing O—O edges with Ca polyhedra of the layers.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Friedrich Liebau (1926–2011) Memorial
- On the symmetry and atomic ordering in (OH,F)-rich spessartine: towards a new hydrogarnet end-member
- Structural and 57Fe Mössbauer spectroscopic characterization of the synthetic NaFeSi2O6 (aegirine) – CaMgSi2O6 (diopside) solid solution series
- A neutron/X-Ray diffraction, IR, and 1H/29Si NMR Spectroscopic investigation of armenite: behavior of extra framework Ca cations and H2O molecules in microporous silicates
- RUB-55, a new hydrous layer silicate with silicate layers known as motives of the sodalite and octadecasil frameworks: Synthesis and crystal structure
- Crystal structure and morphology of fully hydrated zeolite Na-A
- A new borosilicate feldspar, KBSi3O8: synthesis, crystal structure and thermal behavior
- The crystal structure of aklimaite, Ca4[Si2O5(OH)2](OH)4 · 5 H2O
- The [9]-coordinated X site in the crystal structure of tourmaline-group minerals
- Crystal structure of 2M and 1A polytypes of balangeroite
- Twinnite, Pb0.8Tl0.1Sb1.3As0.8S4, the OD character and the question of its polytypism
- The new oxosilicate NaTbSi2O6: A comparison of its A- and D-type structure
- K2Ba5Si12O30 – a member of a homologous series among layered potassium barium silicates
- Synthesis and structures of two open-framework manganese phosphate-silicates
- Glass structural studies for borosilicates of the KBSi2O6—RbBSi2O6 system from X-ray diffraction data
