AM_Brianite Formula: Na2 Ca Mg P2 O8 Name: Brianite Unit cell: 9.12 5.198 13.37 90.0 90.78 90.0 , V=633.76 Space group: P121/C1 (14)

Alkemper J , Fuess H , Zeitschrift fur Kristallographie , 213 (1998) p.282-287, The crystal structures of NaMgPO4, Na2CaMg(PO4)2 and Na18Ca13Mg5(PO4)18:, new examples for glaserite related structures, Locality: synthetic, Note: known as the alpha polymorph of Na2CaMg(PO4)2