Citation: Mills, S.; Mumme, G.; Grey, I.; Bordet, P. (2006). The crystal structure of perhamite Note: H positions unknown. Mineralogical Magazine, 70, pp. 201-209.
Formula: Al7.7 Ca2.7 H12.68 O45.862 P4 Si3 Sr0.3
List type: noninterleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al8 O45 P4 Si14 (Al8 O45 P4 Si14)
Multiplicity: 1