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Crystal-chemical investigation of Al 2(PO 4)(OH) 3augelite from Rapid Creek, Yukon, Canada

Abstract The structural characterization of Al 2(PO 4)(OH) 3augelite, a natural orthophosphate coming from Rapid Creek, Yukon, Canada, was carried out by means of a multi-methodological approach based on WDS-EMPA chemical analysis, single crystal X-ray diffraction, and infrared spectroscopy. The structure was solved in the C2 /mmonoclinic space group, with the following unit cell constants: a= 13.0740(10), b= 7.9690(7), c= 5.0910(7) Å, β= 112.282(5)°, V= 490.81(9) Å 3. Phosphorus atoms display tetrahedral (PO 4) coordination, while aluminum cations display octahedral and unusual five-fold coordination. The framework of the mineral can be viewed as the repetition of cationic arrays made up by AlO 6/AlO 5polyhedra, bridged by PO 4groups, and further joined by O–H···O hydrogen bonds: such interactions were also correlated to IR spectroscopy analysis, by means of Libowitzky formula applied on OH stretching vibrations.