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An application of the near infrared spectroscopy to the study of the selenite minerals: chalcomenite, clinochalcomenite and cobaltomenite

Frost, Ray L., Reddy, B. Jagannadha, & Keeffe, Eloise C. (2008) An application of the near infrared spectroscopy to the study of the selenite minerals: chalcomenite, clinochalcomenite and cobaltomenite. Journal of Near Infrared Spectroscopy, 16(4), pp. 399-407.

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Abstract

The selection of five naturally occurring selenite minerals that contain two different transition metal ions, Cu2+ and Co2+ could be distinguished by NIR spectroscopy. Dependence of composition on spectral properties is a key to mineral identification and differentiation of the members of the selenite group. The nature of the band positions and splitting of band components in the electronic spectra of Cu2+ selenites in the region 12400-8000 cm-1 are in conformity with octahedral geometry distortion. Observation of two split components for the Co2+ band near 9000 cm-1 in cobaltomenites is considered as the vibrational satellites of spin-allowed transition 4T1g(F) ® 4T2g(F). Bands observed at 6950 and 6810 and 6700 cm-1 are the overtones of OH stretches of structural water in selenites and a strong absorption feature near 6700 cm-1 is the result of hydrogen bonding between (SeO3)2− and H2O. These bands are shifted in cobaltomenites. A sharp absorption band at 5170 cm-1 is a common feature in all the spectra of selenite minerals and is the contribution by the combinations of the OH vibrations of water molecules, v3 and v1. A series of overlapping bands around 4500 and 4100 cm-1 is the result of the combination of the vibrational modes of (SeO3)2− ion in the minerals.

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3 citations in Web of Science®

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ID Code: 14733
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal's website (see link) or contact the author. Author contact details: r.frost@qut.edu.au
Keywords: chalcomenite, clinochalcomenite, cobaltomenite, NIR spectroscopy, Cu and Co, selenite minerals
DOI: 10.1255/jnirs.808
ISSN: 0967-0335
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2008 IM Publications
Deposited On: 05 Sep 2008
Last Modified: 29 Feb 2012 23:48

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