Abstract
The molecular structure of the copper–lead silicate mineral luddenite has been analysed using vibrational spectroscopy. The mineral is only one of many silicate minerals containing copper. The intense Raman band at 978cm−1 is assigned to the ν1 (A1g) symmetric stretching vibration of Si5O14 units. Raman bands at 1122, 1148 and 1160cm−1 are attributed to the ν3 SiO4 antisymmetric stretching vibrations. The bands in the 678–799cm−1 are assigned to OSiO bending modes of the (SiO3)n chains. Raman bands at 3317 and 3329cm−1 are attributed to water stretching bands. Bands at 3595 and 3629cm−1 are associated with the stretching vibrations of hydroxyl units suggesting that hydroxyl units exist in the structure of luddenite.
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