AM_Ca5H2(AsO4)4_5H2O Formula: As2 Ca2.5 O10.5 H8 Name: Ca5H2(AsO4)4*5H2O Unit cell: 8.286 6.673 9.743 86.58 111.1 99.74 , V=495.35 Space group: P-1 (2)

Catti M , Ivaldi G , Zeitschrift fur Kristallographie , 157 (1981) p.119-130, Mechanism of the reaction Ca5H2(AsO4)4*9H2O (ferrarisite) ->, Ca5H2(AsO4)4*5H2O) (dimorph of vladimirite), and structure of the latter phase, Note: formed by dehydrating ferrarisite at 60 C, Locality: Sainte-Marie-aux-Mines (Alsace), France