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A Raman spectroscopic study of humite minerals

Frost, Ray L., Palmer, Sara J., Bouzaid, Jocelyne M., & Reddy, B. Jagannadha (2007) A Raman spectroscopic study of humite minerals. Journal of Raman Spectroscopy, 38(1), pp. 68-77.

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Abstract

Raman spectroscopy has been used to study the structure of the humite mineral group ((A2SiO4)n - A(OH, F)2 where n represents the number of olivine and brucite layers in the structure and is 1,2,3 or 4 and A2+ is Mg, Mn, Fe or some mix of these cations). The humite group of minerals forms a morphotropic series with the minerals olivine and brucite. The members of the humite group contain layers of the olivine structure that alternate with layers of the brucite-like sheets. The minerals are characterized by a complex set of bands in the 800 to 1000 cm-1 region attributed to the stretching vibrations of the olivine (SiO4)4- units. The number of bands in this region is influenced by the number of olivine layers. Characteristic bending modes of the (SiO4)4- units are observed in the 500 to 650 cm-1 region. The brucite sheets are characterized by the OH stretching vibrations in the 3475 to 3625 cm-1. The position of the OH stretching vibrations is determined by the strength of the hydrogen bond formed between the brucite-like OH units and the olivine silica layer. The number of olivine sheets and not the chemical composition determines the strength of the hydrogen bonds.

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ID Code: 6193
Item Type: Journal Article
Keywords: humite, clinohumite, olivine, brucite, silicate, Raman and IR spectroscopy
DOI: 10.1002/jrs.1601
ISSN: 1097-4555
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2007 John Wiley & Sons
Copyright Statement: The definite version is available on publication at www3.interscience.wiley.com
Deposited On: 14 Feb 2007
Last Modified: 06 May 2014 09:44

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