Abstract
Three wardite mineral samples from different origins have been analysed by vibrational spectroscopy. The mineral is unusual in that it belongs to a unique symmetry class, namely the tetragonal–trapezohedral group. The structure of wardite contains layers of corner-linked OH bridged MO6 octahedra stacked along the tetragonal C-axis in a four-layer sequence and linked by PO4 groups. Consequentially not all phosphate units are identical. Thus, two intense Raman bands observed at 995 and 1051cm−1 are assigned to the ν1 PO43− symmetric stretching mode. Intense Raman bands are observed at 605 and 618cm−1 with shoulders at 578 and 589cm−1 are assigned to the ν4 out of plane bending modes of the PO43−. The observation of multiple bands supports the concept of non-equivalent phosphate units in the structure. Sharp infrared bands are observed at 3544 and 3611cm−1 are attributed to the OH stretching vibrations of the hydroxyl units. Vibrational spectroscopy enables subtle details of the molecular structure of wardite to be determined.
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