AM_Rauenthalite Formula: Ca3 As2 O18 H20 Name: Rauenthalite Unit cell: 12.564 12.169 6.195 89.09 79.69 118.58 , V=812.65 Space group: P-1 (2)

Catti M , Ivaldi G , Acta Crystallographica, Section B , 39 (1983) p.4-10, On the topotactic dehydration Ca3(AsO4)2*11H2O (phaunouxite) ->, Ca3(AsO4)2*10H2O (rauenthalite), and the structures of both minerals, Locality: Sainte Marie-aux-Mines, Alsace, France