AM_Gorgeyite
Formula: K2 Ca5 S6 O25 H2
Name: Gorgeyite
Unit cell: 17.51 6.822 18.21 90.0 113.3 90.0 , V=1997.84
Space group: C12/C1 (15)

Smith G W , Walls R , Zeitschrift fur Kristallographie , 151 (1980) p.49-60, The crystal structure of goergeyite K2SO4*5CaSO4*H2O, Locality: Astakos, Greece