Citation: Rius, J.; Allmann, R. (1984). The superstructure of the double layer mineral wermlandite [Mg7(Al0.57,Fe3+0.43)2(OH)18]2+[(Ca0.6,Mg0.4)(SO4)2(H2O)12]2-. Zeitschrift fur Kristallographie, 168, pp. 133-144.
Formula: Al1.14 Ca0.6 Fe0.86 H42 Mg7.4 O38 S2
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al2 Fe2 H18 Mg7 O18 (Al2 Fe2 H18 Mg7 O18)
Multiplicity: 1