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Über die Struktur des Pharmakosiderits


Pharmacosiderite has been investigated by Laue, powder, and rotation photographs. The space group isT d 1 . From the analysis of the literature the formula [Fe4(OH)4(AsO4)3] · K · 6–7 H2O has been derived. K+ and H2O fill up the large channels of a framework of AsO4-tetrahedrons and Fe3(OH)3O3-octahedrons. The intensities calculated are generally in conformity with the observation.

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  1. 1

    G. Hägele undF. Machatschki, Fortschr. Min.21, 77 (1937).

  2. 2

    E. G. J. Hartley, Z. Kristallogr.32, 220 ff. (1900).

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Zemann, J. Über die Struktur des Pharmakosiderits. Experientia 3, 452 (1947).

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