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The crystal structure of katayamalite, ideally KLi 3 Ca 7 Ti 2 (SiO 3 ) 12 (OH) 2  (potassium trilithium hepta­calcium dititanium dodeca­silicate di­hydroxide), was previously reported in triclinic symmetry ( C -1), with isotropic displacement parameters for all atoms and without the H-atom position [Kato & Murakami (1985  ▶ ).  Mineral. J.   12 , 206–217]. The present study redetermines the katayamalite structure with monoclinic symmetry (space group  C 2/ c ) based on single-crystal X-ray diffraction data from a sample from the type locality, Iwagi Island, Ehime Prefecture, Japan, with anisotropic displacement parameters for all non-H atoms, and with the H atoms located by difference Fourier analysis. The structure of katayamalite contains a set of six-membered silicate rings inter­connected by sheets of Ca atoms on one side and by an ordered mixture of Li, Ti and K atoms on the other side, forming layers which are stacked normal to (001). From the eight different metal sites, three are located on special positions,  viz . one K and one Li atom on twofold rotation axes and one Ca atom on an inversion center. The Raman spectrum of kataymalite shows a band at 3678 cm −1 , similar to that observed for hydroxyl-amphiboles, indicating no or very weak hydrogen bonding.

Redetermination of katayamalite, KLi3Ca7Ti2(SiO3)12(OH)2

Redetermination of katayamalite, KLi₃Ca₇Ti₂(SiO₃)₁₂(OH)₂