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Low-potash gismondine from Ireland and Iceland

Published online by Cambridge University Press:  14 March 2018

G. P. L. Walker
G. P. L. Walker*
Affiliation:
Imperial College, London S.W. 7
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Summary

Gismondine is recorded from the Tertiary basalts of the North Atlantic region, from a total of some 40 localities in Antrim and Iceland. It occupies a well-marked position in the sequence of zeolite zones in the lavas, and the characteristic associates are chabazite, thomsonite, and phillipsite. Five new chemical analyses of gismondine from these localities show a negligible content of potash, and indicate plagioclase-type substitution, giving a series ranging from near Ca8Al16Si16O64.34H2O to near Na2·5Ca5·5Al13·5Si18·5O64.34H2O. Substitution of NaSi for CaAl leads to a decrease in refringence, birefringence, and density.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 258 , September 1962 , pp. 187 - 201
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1962

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References

Caglioti, (V.), 1927. Rend. Accad. Sci. Pis. Mat. Napoli , ser. 3, vol. 33, pp. 156–177.Google Scholar
Coombs, (D. S.), Ellis, (A. J.), Fyfe, (W. S.), and Taylor, (A. M.), 1959. Geochimica Acta , vol. 17, p. 53.Google Scholar
Daubree, (A.), 1879. Etudes synthetiqués de géologie expérimentale , p. 185.Google Scholar
Doelter, (C), 1921. Handb. Mineralchem., Bd. II, 3rd part, p. 30.Google Scholar
Dunham, (K. C), 1933. Amer. Min. , vol. 18, p. 369.Google Scholar
Fleischmann, (F. N. A.), 1910. Min. Mag. , vol. 15, p. 288.Google Scholar
Hey, (M. H.), 1932. Min. Mag. , vol. 23, p. 421.CrossRefGoogle Scholar
Hibsch, (J. E.), 1917. Tschermaks Min. Petr. Mitt. , vol. 34, p. 187.Google Scholar
Hintze, (C), 1897. Handb. Min., vol. 2, p. 1809.Google Scholar
Jaffe, (H. W.), 1956. Amer. Min., vol. 41, p. 457.Google Scholar
Keaus, (C), 1939. Zentr. Min., Abt. A, p. 105.Google Scholar
Larsen, (E. S.), 1921. U.S. Geol. Surv. Bull., 679.Google Scholar
Walker, (G. P. L.), 1951. Min. Mag., vol. 29, p. 773.Google Scholar
Walker, (G. P. L.), 1959. Quart. Journ. Geol. Soc, vol. 114, p. 367.Google Scholar
Walker, (G. P. L.), 1960a. Min. Mag., vol. 32, p. 503.Google Scholar
Walker, (G. P. L.), 1960b. Journ. Geol., vol. 68, p. 515.Google Scholar
Winohell, (A. N.), 1925. Amer. Min., vol. 10, p. 112.Google Scholar