AM_Montgomeryite_1 Formula: Ca2 Al2 P3 Mg.5 O20 H18 Name: Montgomeryite Unit cell: 10.004 24.083 6.235 90.0 91.6 90.0 , V=1501.59 Space group: C12/C1 (15)

Fanfani L , Nunzi A , Zanazzi P F , Zanzari A R , American Mineralogist , 61 (1976) p.12-14, Additional data on the crystal structure of montgomeryite