Abstract
Aklimaite, Ca 4 [Si 2 O 5 (OH) 2 ](OH) 4 · 5 H 2 O, is monoclinic, space group C 2/ m , a = 16.907(5), b = 3.6528(8), c = 13.068(4) Å, β = 117.25(4)°, V = 717.5(4) Å 3 , Z = 2. The crystal structure was solved by direct methods and refined to R (F) = 0.1100 for 1196 unique reflections with I > 2 σ ( 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 Si 2 O 5 (OH) 2 groups which are combined in a motif like interrupted chains (“dotted lines”) sharing O—O edges with Ca polyhedra of the layers.
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