Raman spectroscopy of the nickel silicate mineral pecoraite –an anologue of chrysotile (asbestos)
Frost, Ray L., Reddy, B. Jagannadha, & Dickfos, Marilla J. (2008) Raman spectroscopy of the nickel silicate mineral pecoraite –an anologue of chrysotile (asbestos). Journal of Raman Spectroscopy, 39(7), pp. 909-913.
The molecular structure of the mineral pecoraite, the nickel analogue of chrysotile of formula Ni3Si2O5(OH)4 has been analysed by a combination of Raman and infrared spectroscopy. A comparison is made with the spectra of the minerals nepouite and chrysotile and a synthetic pecoraite. Pecoraite is characterised by OH stretching vibrations at 3645 and 3683 cm-1 attributed to the inner and inner surface hydroxyl stretching vibrations. Intense infrared bands at around 3288 and 3425 cm-1 are assigned to the stretching vibrations of water strongly hydrogen bonded to the surface of the pecoraite. The asbestos-like mineral is charactersied by SiO stretching vibrations at 979, 1075, 1128, 1384 cm-1, OSiO chain vibrations at 616 and 761 cm-1 and Ni-O(H) vibrations at 397 and 451 cm-1.
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