AM_Leonite_1
Formula: K2 Mg S2 O12 H8
Name: Leonite
Unit cell: 11.78 9.486 19.73 90.0 95.23 90.0 , V=2195.55
Space group: I12/A1 (15)

Hertweck B , Giester G , Libowitzky E , American Mineralogist , 86 (2001) p.1282-1292, The crystal structures of the low-temperature phases of leonite-type compounds,, K2Me(SO4)2.4H2O (Me=Mg,Mn,Fe), Sample: K2Mg(SO4)2.4H2O, T = 170 K