AM_Leightonite Formula: K O9 Ca Cu.68 S2 H4 Name: Leightonite Unit cell: 11.654 7.497 10.097 90.0 125.21 90.0 , V=720.78 Space group: C12/C1 (15)

Menchetti S , Bindi L , Bonazzi P , Olmi F , American Mineralogist , 87 (2002) p.721-725, Disordered distribution of Cu in the crystal structure of leightonite,, K2Ca2Cu(SO4)4.2H2O