AM_Guanacoite_1 Formula: Cu2.582 Mg2.418 As2 O16 H12 Name: Guanacoite Unit cell: 5.475 16.865 6.915 90.0 99.8 90.0 , V=629.19 Space group: P121/C1 (14)

Witzke T , Kolitsch U , Krause W , Wiechowski A , Medenbach O , Kampf A R , Steele I M , Favreau G , European Journal of Mineralogy , 18 (2006) p.813-821, Guanacoite, Cu2Mg2(Mg0.5Cu0.5)(OH)4(H2O)4(AsO4)2, a new arsenate mineral, species from the El Guanaco Mine, near Taltal, Chile: Description and crystal structure, Locality: El Guanaco Mine, Taltal, Chile