AM_Lapeyreite Formula: Cu2 As1.32 O6.5 H2 Name: Lapeyreite Unit cell: 19.158 2.9361 9.193 90.0 103.26 90.0 , V=503.32 Space group: C12/M1 (12)

Sarp H , Cerny R , Babalik H , Hatipoglu M , Mari G , American Mineralogist , 95 (2010) p.171-176, Lapeyreite, Cu3O[AsO3(OH)]2x0.75H2O, a new mineral: Its description and crystal structure, Locality: Daluis Gorge, Var Valley, Alpes-Maritimes, France