AM_Pharmacosiderite_1 Formula: As3 Fe4 O23 H18 Name: Pharmacosiderite Unit cell: 7.91 7.91 7.91 90.0 90.0 90.0 , V=494.91 Space group: P-43M (215)

Zemann J , Tschermaks Mineralogische und Petrographische Mitteilungen , 1 (1948) p.1-13, Formel und strukturtyp des pharmakosiderits, Note: the K atom could not be located, Locality: Cornwall, England