AM_Alpersite_1 Formula: (Mg.555 Cu.445) S O11 H14 Name: Alpersite Unit cell: 14.189 6.547 10.83 90.0 105.872 90.0 , V=967.70 Space group: P121/C1 (14)

Peterson R C , Hammarstrom J M , Seal R R , American Mineralogist , 91 (2006) p.261-269, Alpersite (Mg,Cu)SO4*7H2O, a new mineral of the melanterite group, and cuprian, pentahydrite: Their occurrence within mine waste, Locality: Miami, Arizona, USA