AM_Tinaksite Formula: K2 Na Ca2 Ti Si7 O20 H Name: Tinaksite Unit cell: 10.377 12.166 7.059 90.91 99.3 92.76 , V=878.19 Space group: P-1 (2)

Bissert G , Acta Crystallographica, Section B , 36 (1980) p.259-263, Verfeinerung der struktur von tinaksit, Ca2K2NaTiO[Si7O18(OH)], Note: z-coordinate of Si4 adjusted to match reported bond lengths