AM_Alpersite Formula: (Mg.683 Cu.317) S O11 H14 Name: Alpersite Unit cell: 14.166 6.534 10.838 90.0 105.922 90.0 , V=964.69 Space group: P121/C1 (14)

Peterson R C , Hammarstrom J M , Seal II 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: Big Mike mine, Nevada, USA