AM_Wadeite Formula: K2 Si4 O9 Name: Wadeite Unit cell: 6.612 6.612 9.51 90.0 90.0 120.0 , V=360.06 Space group: P63/M (176)

Swanson D K , Prewitt C T , American Mineralogist , 68 (1983) p.581-585, The crystal structure of K2SiSi3O9, Note: B(1,2) for K and Si1 have been changed to match symmetry constraints