AM_Tienshanite Formula: Ba6 Ti12 Mn6 Ca2 K Na12 Si36 B12 O123 F2 Name: Tienshanite Unit cell: 16.785 16.785 10.454 90.0 90.0 120.0 , V=2550.68 Space group: P6/M (175)

Cooper M A , Hawthorne F C , The Canadian Mineralogist , 36 (1998) p.1305-1310, Refinement of the crystal structure of tienshanite: short-range-order, constraints on chemical composition