Raman and infrared spectroscopic study of turquoise minerals

Jiří Čejka; Jiří Sejkora; Ivo Macek; Radana Malíková; Lina Wang; Ricardo Scholz; Yunfei Xi; Ray L Frost

doi:10.1016/j.saa.2015.04.029

Raman and infrared spectroscopic study of turquoise minerals

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Oct 5:149:173-82. doi: 10.1016/j.saa.2015.04.029. Epub 2015 Apr 21.

Authors

Jiří Čejka¹, Jiří Sejkora², Ivo Macek², Radana Malíková², Lina Wang³, Ricardo Scholz⁴, Yunfei Xi³, Ray L Frost⁵

Affiliations

¹ Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, CZ-193 00 Praha 9, Czech Republic; School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
² Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, CZ-193 00 Praha 9, Czech Republic.
³ School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
⁴ Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35,400-00, Brazil.
⁵ School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. Electronic address: r.frost@qut.edu.au.

PMID: 25956330
DOI: 10.1016/j.saa.2015.04.029

Abstract

Raman and infrared spectra of three well-defined turquoise samples, CuAl6(PO4)4(OH)8·4H2O, from Lavender Pit, Bisbee, Cochise county, Arizona; Kouroudaiko mine, Faleme river, Senegal and Lynch Station, Virginia were studied, interpreted and compared. Observed Raman and infrared bands were assigned to the stretching and bending vibrations of phosphate tetrahedra, water molecules and hydroxyl ions. Approximate O-H⋯O hydrogen bond lengths were inferred from the Raman and infrared spectra. No Raman and infrared bands attributable to the stretching and bending vibrations of (PO3OH)(2-) units were observed.

Keywords: Hydroxyl ions; Infrared spectroscopy; Phosphate; Raman spectroscopy; Turquoise.

Publication types

Research Support, Non-U.S. Gov't