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The structure of shafranovskite, ideally K 2 Na 3 (Mn,Fe,Na) 4 [Si 9 (O,OH) 27 ](OH) 2 ⋅nH 2 O (n ∼ 2.33), a K-Na-manganese hydrous silicate from Kola peninsula, Russia, was studied using synchrotron X-ray radiation and a MAR345 image-plate detector at the Swiss-Norwegian beamline of the European Synchrotron Radiation Facility (ESRF, Grenoble, France). The structure [trigonal, space group P31c, a = 14.519(3), c = 21.062(6) Å, V = 3844.9(14) Å 3 ] was solved by direct methods and partially refined to R1 = 0.085 (wR 2  = 0.238) on the basis of 2243 unique observed reflections (|F o | ≥ 4σ F ). Shafranovskite is a 2:1 hydrous phyllosilicate. Sheets of Mn and Na octahedra (O sheets) are sandwiched between two silicate tetrahedral sheets (T 1  and T 2 ). The 2:1 layers are parallel to (001). The upper tetrahedral sheet T 1  consists of isolated [Si 13 (O,OH) 37 ] islands composed of three six-membered rings. The octahedral sheet O consists of Mnφ 6 , Na1φ 6 , and Na2φ 6  octahedra (φ = O, OH, H 2 O). This unit can be considered as a trioctahedral sheet with each 20 th  octahedron vacant. The lower tetrahedral sheet T 2  consists of [Si 13 (O,OH) 37 ] islands linked into a sheet through an additional SiO 3 OH tetrahedron. The Na3, K1, K2 atoms, and H 2 O32 groups are between the 2:1 layers and provide their linkage along c.

american mineralogist

Synchrotron X-ray diffraction study of the structure of shafranovskite, K 2 Na 3 (Mn,Fe,Na) 4 [Si 9 (O,OH) 27 ](OH) 2 ⋅nH 2 O, a rare manganese phyllosilicate from the Kola peninsula, Russia