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American Mineralogist; January 2003; v. 88; no. 1; p. 37-46
© 2003 Mineralogical Society of America
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An infrared spectroscopic study of the basic copper phosphate minerals: Cornetite, libethenite, and pseudomalachite

Wayde Martens and Ray L. Frost*

Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia

Correspondence: * E-mail: r.frost{at}qut.edu.au

The molecular structures of the basic copper phosphate minerals pseudomalachite, libethenite, and cornetite were studied using a combination of infrared emission spectroscopy, infrared absorption, and Raman spectroscopy. Infrared emission spectra of these minerals were obtained over the temperature range 100 to 1000 °C.

The infrared spectra of the three minerals are different, in line with differences in crystal structure and composition. The absorption spectra are similar, particularly in the OH stretching region, but characteristic differences in the bending regions are observed. Differences are also observed in the phosphate stretching and bending regions. The IR emission of the basic copper phosphates studied shows that the minerals are completely dehydroxylated by 550 °C.




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