Citation: Mills, S. J.; Hager, S. L.; Leverett, P.; Williams, P. A.; Raudsepp, M. (2010). The structure of H3O+ - exchanged pharmacosiderite. Mineralogical Magazine, 74, pp. 487-492.
Formula: As3 Fe4 O21.5
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: As3 Fe4 O16 (As3 Fe4 O16)
Multiplicity: 1
Coordination sequences: