AM_Picromerite_1 Formula: Mg K2 S2 O14 H12 Name: Picromerite Unit cell: 9.072 12.212 6.113 90.0 104.83 90.0 , V=654.68 Space group: P121/A1 (14)

Kannan K K , Viswamitra M A , Zeitschrift fur Kristallographie , 122 (1965) p.161-174, Crystal structure of magnesium potassium sulfate hexahydrate MgK2(SO4)2*6(H2O), Locality: synthetic