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Studies of the orthoamphiboles III. Hydroxyl spectra of gedrites

Published online by Cambridge University Press:  05 July 2018

Anthony D. Law
Anthony D. Law*
Affiliation:
Department of Geology and Mineralogy, University of Oxford
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Abstract

Infra-red spectra of gedrites have been measured in the hydroxyl region (3800–3500 cm−1). The spectra can be related to those of clinoamphiboles and of anthophyllites, and show the normal amphibole pattern of peaks whose intensities reflect the proportions of different cations in the adjacent octahedral sites. The absorption is weak especially in spectra of gedrites high in Al. Hyperfine splitting of peaks has been observed in anthophyllite spectra (Law, 1981) but the extent of hyperfine splitting in gedrite spectra is limited. The underlying baseline absorption, upon which the hydroxyl peaks are superimposed, becomes steeper and more awkward to estimate in gedrites. Some higher frequency peaks, probably arising from unit cells with A sites occupied by Na, are observed.

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 63 - 71
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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Footnotes

*

Present Address: BP Petroleum Development (Overseas) Ltd., Britannic House, Moor Lane, London EC2Y 9BU.

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