Abstract
The compound Ge(OH)PO4 has been prepared by hydrothermal synthesis. The crystal structure is determined by means of three-dimensional single-crystal data (147 independent reflections, R = 0.122). The structure is built up by octahedral chains of composition [GeO4(OH)], which are connected by [PO4] tetrahedra forming a three-dimensional network, which exhibits one-dimensional disorder phenomena (OD structure). The determined crystal structure with the orthorhombic unit cell: a = 12.253, b = 7.014 and c = 7.161 Å space group Bmam–D2h21 and Z = 8 is a result of superimposed twinned regions, which can be described by a monoclinic unit cell: a = 7.096, b = 7.014 and c = 7.161 Å, β = 120° 18′, space group C2/c–C2h6 and Z = 4. A structural relationship between Ge(OH)PO4 and the minerals kieserite, titanite (sphene), lazulite and amblygonite is discussed.
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