AM_Pentahydrite_1 Formula: (Mg.4 Cu.6) S O9 H10 Name: Pentahydrite Unit cell: 6.247 10.5995 6.0395 82.53 109.408 104.794 , V=364.23 Space group: P-1 (2)

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