Abstract
The minerals mimetite Pb 5(AsO 4) 3Cl, arsenian pyromorphite Pb 5(PO 4,AsO 4) 3Cl and hedyphane Pb 3Ca 2(AsO 4) 3Cl have been studied by Raman spectroscopy complimented with infrared spectroscopy. Mimetite is characterised by a band at 812–3 cm −1 attributed to the A g mode. For the arsenian pyromorphite this band is observed at 818 cm −1 and for hedyphane at 819 cm −1. For mimetite and hedyphane bands at 788 and 765 cm −1 are attributed to A u and E 1u vibrational modes and are both Raman and infrared active. For the arsenian pyromorphite, Raman bands at 917–1014 cm −1 are attributed to phosphate stretching vibrations. Raman spectroscopy clearly identifies bands attributable to isomorphous substitution of arsenate by phosphate. The observation of low intensity bands in the 3200–3550 cm −1 region are assigned to adsorbed water and OH units, thus indicating some replacement of chloride ions with hydroxyl ions.
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