AM_Na18Ca13Mg5(PO4)18 Formula: Ca13 Na18 Mg5 P18 O72 Name: Na18Ca13Mg5(PO4)18 Unit cell: 15.811 15.811 21.499 90.0 90.0 120.0 , V=4654.44 Space group: R-3M (166)

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