The crystal structure of tarbuttite, Zn2(OH)PO4

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Abstract
Tarbuttite is triclinic, space group P [unk]. The cell parameters are: a = 5.499 Å, b = 5.654 Å, c = 6.465 Å, α = 102°51′, β = 102°46′, γ = 86°50′. There are two formula units of Zn 2 (OH)PO 4 per unit cell. The crystal structure has been solved from Patterson projections and statistical methods. Three-dimensional isotropic least-squares refinement yielded a final discrepancy index R = 0.12. The arrangement of oxygens about the Zn ions is a nearly regular trigonal bipyramid with average Zn–O distances of 2.04 Å. The PO 4 configuration is a regular tetrahedron with a mean P–O bond length of 1.54 Å. The framework consists of zig-zag chains of Zn 1 coordination polyhedra along b -axis direction, connected together by discrete PO 4 tetrahedra and pairs of Zn 2 coordination polyhedra.