Determination and refinement of the crystal structure of turquois, CuAl6(PO4)4(OH)8· 4H2O

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Abstract
Turquois is triclinic, space group P[unk], with cell dimensions a = 7.424 Å, b = 7.629 Å, c = 9.910 Å, α = 68.61°, β = 79.71°, γ = 65.08°. The cell contains one formula of CuAl6(PO4)4(OH)8 · 4H2O, so the Cu atom is fixed in an inversion center. Three-dimensional intensity data were collected on a singlecrystal diffractometer using a proportional counter as detector, and were corrected for Lorentz-polarization factors and absorption. The interpretation of a three-dimensional Patterson function and of a three-dimensional electrondensity function based on signs due to the Cu contribution only, gave a trial

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