Citation: Fanfani, L.; Nunzi, A.; Zanazzi, P. F.; Zanzari, A. R. (1976). Additional data on the crystal structure of montgomeryite. American Mineralogist, 61, pp. 12-14.
Formula: Al2 Ca2 H18 Mg0.5 O20 P3
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al8 Mg4 O72 P12 (Al2 Mg O18 P3)
Multiplicity: 1