Phosphophyllite from Potosi, Bolivia, Zn2Fe(PO4)2 · 4H2O, is monoclinic and crystallizes in space group P21/c, with a = 10.378(3), b = 5.084(1), с = 10.553(3) A, β = 121.14(2)°, and Z = 2. The structure has been solved by Patterson and Fourier methods from 1999 Zr-filtered МоK⍺ data and refined by full matrix least-squares (including the hydrogen atoms) to R = 0.032 (Rw = 0.035). The framework consists of [Zn2P2O7] tetrahedral sheets identical to those in hopeite, interleaved with [FeO · 4H2O] octahedral sheets similar to those in parahopeite.

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First page of The crystal structure of phosphophyllite
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