AM_Kainite
Formula: K4 S4 Mg4 Cl4 O27 H22
Name: Kainite
Unit cell: 19.72 16.23 9.53 90.0 94.92 90.0 , V=3038.89
Space group: C12/M1 (12)

Robinson P D , Fang J H , Ohya Y , American Mineralogist , 57 (1972) p.1325-1332, The crystal structure of kainite, Locality: Stassfurt, Germany