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crystal data
Metastable barysilite-like Pb3[Ge2O7] was obtained from the melt at a sufficiently high cooling rate together with stable Pb5Ge3O11, α-PbGeO3, and a homologous series of other metastable lead germanates. The crystal data derived from an indexed powder diagram are a = 10.2960(6), c = 39.805(4) Å, space group Rc, Dm = 7.18, and Dx = 7.188 Mg m−3 for Z = 18. The JCPDS Diffraction File No. for Pb3[Ge2O7] is 33-1487.