Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-02T18:46:23.019Z Has data issue: false hasContentIssue false

Studies of the orthoamphiboles III. Hydroxyl spectra of gedrites

Published online by Cambridge University Press:  05 July 2018

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

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
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

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

References

Bancroft, G. M., and Burns, R. G. (1969) Mineral. Soc. Am. Spec. Paper, 2, 137-50.Google Scholar
Bancroft, G. M., Maddock, A. G., Burns, R. G., and Strens, R. G. J. (1966) Nature, 212, 913-15.CrossRefGoogle Scholar
Barker, F. (1961) U.S. Geol. Surv. Prof. Pap. 424C, C336-8 [cited by Papike and Ross, 1970].Google Scholar
Borg, I. Y. (1967) Mineral. Mag. 36, 58390.Google Scholar
Burns, R. G., and Greaves, C. (1971) Am. Mineral. 56, 2010-33.Google Scholar
Burns, R. G. and Law, A. D. (1970) Nature, 226, 73-5.CrossRefGoogle Scholar
Burns, R. G. and Strens, R. G. J. (1966) Science, 153, 770-6.Google Scholar
Des Cloizeaux, A. L. O. L. (1877) C.R. Acad. Sci. Paris, 84, 1473-5.Google Scholar
Eskola, P. (1914) Bull. Comm. g∼ol. Finlande, 40, 169-77.Google Scholar
Eskola, P. [with T. Kervinen] (1936) Ibid. 115, 475-87.Google Scholar
Fabries, J., and Perseil, E. A. (1971) Bull. Soc.fr. Minbral. Cristallogr. 94, 385-95.Google Scholar
Francis, G. H. (1955) Mineral. Mag. 30, 709-16.Google Scholar
Francis, G. H. (1956) Ibid. 30, 173-86.Google Scholar
Heinrich, E. W. (1950) Am. Mineral. 35, 764-71.Google Scholar
Henderson, E. P. (1931) Ibid. 16, 563-8.Google Scholar
Iskyul, V. (1925) [Experimental investigations in the province of the chemical composition of the silicates, Petrograd, 1917]. Seen in M.A. 2, 207.Google Scholar
Kunitz, W. (1930) Neues Jahrb. Mineral. Abh. A, 60, 171-250.Google Scholar
Law, A. D. (1976) In The Physics and Chemistry of Minerals and Rocks, Strens, R. G. J. (ed.), Wiley, 677-86.Google Scholar
Law, A. D. (1981) Bull. mineral. 104, 423-30.Google Scholar
Law, A. D. and Whittaker, E. J. W. (1981) Ibid. 104, 381-6.Google Scholar
Mason, B. (1953) Am. Mineral. 38, 862-5.Google Scholar
Papike, J. J., and Ross, M. (1970) Ibid. 55, 1945-72.Google Scholar
Pisani, F. (1977) C.R. Acad. Sci. Paris, 84, 1509-12.Google Scholar
Rabbitt, J. C. (1948) Am. Mineral. 33, 263-323.Google Scholar
Robinson, P., and Jaffe, H. W. (1969) Am. J. Sci. 267, 389421.CrossRefGoogle Scholar
Robinson, P., Ross, M., and Jaffe, H. W. (1971) Am. Mineral. 56, 1005-41.Google Scholar
Rowbotham, G., and Farmer, V. C. (1973) Contrib. Mineral. Petrol. 38, 147-9.CrossRefGoogle Scholar
Seki, Y., and Yamasaki, M. (1957) Am. Mineral. 42, 506-20.Google Scholar
Simpson, E. S. (1931) J.R. Soc. West. Austral. 17, 137-49.Google Scholar
Stout, J. H. (1971) Am. Mineral. 56, 212-24.Google Scholar
Stout, J. H. (1972) J. Petrol. 13, 99-145.CrossRefGoogle Scholar
Strens, R. G. J. (1974) In Infrared spectra of minerals, Farmer, V. C. (ed.), Mineral. Soc. monograph 4, 305-30.CrossRefGoogle Scholar
Tilley, C. E. (1957) Am. Mineral. 42, 412-16.Google Scholar
Wilkins, R. W. T., Davidson, L. R., and Ross, M. (1970) Contrib. Mineral. Petrol. 28, 280-7.CrossRefGoogle Scholar