Citation: Swainson, I. P.; Dove, M. T.; Schmahl, W. W.; Putnis, A. (1992). Neutron powder diffraction study of the akermanite-gehlenite solid solution series Sample: O% Ak. Physics and Chemistry of Minerals, 19, pp. 185-195.
Formula: Al2.06 Ca2 O7 Si0.95
List type: noninterleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al10 O14 Si8 (Al5 O7 Si4)
Multiplicity: 1