AM_Wermlandite Formula: Mg7.4 (Al1.14 Fe.86) Ca.6 S2 O38 H42 Name: Wermlandite Unit cell: 9.303 9.303 22.57 90.0 90.0 120.0 , V=1691.64 Space group: P-3C1 (165)

Rius J , Allmann R , Zeitschrift fur Kristallographie , 168 (1984) p.133-144, 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-, Locality: Langban, Warmland, Sweden