AM_Tancoite Formula: H2 Na2 Li Al P2 O9 Name: Tancoite Unit cell: 6.948 14.089 14.065 90.0 90.0 90.0 , V=1376.83 Space group: PBCB (54)

Hawthorne F C , Tschermaks Mineralogische und Petrographische Mitteilungen , 31 (1983) p.121-135, The crystal structure of tancoite