AM_Phaunouxite Formula: Ca3 As2 O19 H22 Name: Phaunouxite Unit cell: 12.563 12.181 6.205 88.94 91.67 113.44 , V=870.80 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