| Abstract: | X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, and Raman spectroscopy were used to study pseudomorphic turquoise from Maanshan City, Anhui province, China. The results indicate that the pseudomorphic turquoise mainly consists of turquoise minerals, which retain the hexagonal structure of kietyoite. The results of the XRD analysis showed that the main d values for pseudomorphic turquoise were 3.6745-3.6748（1T1）, 2.9008-2.9025（123）, 3.4247-3.4293（210）, 3.2709-3.2781（113）, 6.1626-6.1781（011）, and 2.0130-2.0162（~11）, which are in accordance with that of turquoise. The analysis of the FTIR spectrum showed that the ~equencies of the pseudomorphic turquoise bands were in the ranges 3510-3465 cm~ （u（OH） stretching vibration）, 3300-3070 cm~ （u（MFec~H20） stretching vibration）, 1210-1012 cm ~ （u3（PO4） stretching vibration）, around 838 cm ~ （6（OH） bending vibration）, and 655-480 cm ~ （u4（PO4） bending vibration）. The Raman spectroscopy showed that the sharp peak near 3466 cm~ was assigned to D（OH） stretching vibration, the bands ranging from 3281 to 3078 cm~ belong to D（MFecu-H20） stretching vibration, and the peak near 798 cm~ was classified as the 6（OH） bending vibration. |
