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Aluminium replacing silicon in some silicate lattices

Published online by Cambridge University Press:  14 March 2018

W. T. Harry
W. T. Harry*
Affiliation:
Geology Department, University College, Dundee
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Extract

The purpose of this account is to review, from the literature, figures for the replacement of silicon by aluminium in biotites, calciferous amphiboles, and clinopyroxenes. Atomic ratios to be quoted have been calculated on a basis of 24(O,OH,F) in biotites, hornblendes, and pyroxenes alike. This facilitates comparison and the higher factor magnifies differences. It may be emphasized, to avoid possible confusion, that in this discussion it is the amount of silicon replaced by aluminium that will be under review. The ratio of tetrahedrally co-ordinated Al to octahedrally co-ordinated A1 will not be considered, although for the sake of completeness, figures for AI in Y groups will be furnished to show total A1 values. Machatschki's group notation is employed. Comparison between biotites, hornblendes, and clinopyroxenes, for present purposes, may best be made between minerals that crystallized under the same pressure-temperature conditions, to reduce variables. Few analyses of specimens of these three minerals, that have crystallized together in the same rock, are available however. One such paragenesis is quoted below. This association occurs as gneiss-like inclusions in calcite, taken from the Tiree marble.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 209 , June 1950 , pp. 142 - 149
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1950

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References

Page 142 note 1 Hallimond, A. F., Min. Mag., 1947, vol. 28, p. 230.CrossRefGoogle Scholar

Page 142 note 2 Nockolds, S. R., Amer. Journ. Sci., 1947, vol. 245, p. 401. [M.A. 10-271.]CrossRefGoogle Scholar

Page 143 note 1 Hammond, A. F., Amer. Min., 1943, vol. 28, p. 65. [M.A. 9-270.]Google Scholar

Page 144 note 1 Niggli, P., Schweiz. Min. Petr. Mitt., 1943, vol. 23, p. 538.Google Scholar

Page 146 note 1 Alderman, A. R., Quart. Journ. Geol. Soc. London, 1936, vol. 92, p. 519.CrossRefGoogle Scholar

Page 146 note 2 Tilley, C. E., Min. Mag., 1937, vol. 24, p. 565.Google Scholar

Page 146 note 3 Hallimond, A. F., Amer. Min., 1943, vol. 28, p. 65. [M.A. 9-270.]Google Scholar

Page 147 note 1 Nockolds, R. and Mitchell, R. L, Trans. Roy. Soc. Edinburgh, 1948, vol. 61, p. 560. [M.A. 10-424.]Google Scholar

Page 147 note 2 Deer, W. A., Min. Mag., 1938, vol. 25, p. 56.CrossRefGoogle Scholar

Page 148 note 1 Buerger, M. J., The rôle of temperature in mineralogy. Amer. Min., 1948, vol. 33, pp. 101-121. [M.A. 10-380.]Google Scholar

Page 149 note 1 Niggli, P., Das Magma und seine Produkte. Leipzig, 1937. [M.A. 7-2.]Google Scholar

Page 149 note 2 von Eckermann, H., Geol. För. Förh. Stockholm, 1944, vol. 66, p. 283.CrossRefGoogle Scholar