AM_Rhomboclase
Formula: Fe S2 O12 H9
Name: Rhomboclase
Unit cell: 9.687 18.204 5.425 90.0 90.0 90.0 , V=956.66
Space group: PNMA (62)

Peterson R C , Valyashko E , Wang R , The Canadian Mineralogist , 47 (2009) p.625-634, The atomic structure of (H3O)Fe3+(SO4)2 and rhomboclase, (H5O2)Fe3+(SO4)2*2H2O, Locality: Alcoparrosa, Chile