AM_Tassieite_1 Formula: Na.478 Ca2 Fe3.254 Mg2.746 P6 O26 H4 Name: Tassieite Unit cell: 12.4595 11.5955 12.7504 90.0 90.0 90.0 , V=1842.10 Space group: PBCA (61)

Grew E S , Armbruster T , Medenbach O , Yates M G , Carson C J , The Canadian Mineralogist , 45 (2007) p.293-305