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Delhayelite, a new silicate from the Belgian Congo

Published online by Cambridge University Press:  14 March 2018

TH. G. Sahama  and
Kai Hytönen
TH. G. Sahama
Affiliation:
Institute of Geology, University of Helsinki, Finland
Kai Hytönen
Affiliation:
Institute of Geology, University of Helsinki, Finland
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Summary

The complex kalsilite-bearing melilite-nephelinite from Mt. Shaheru in the Belgian Congo with götzenite, combeite, and kirschsteinite contains yet another new silicate for which the name delhayelite is proposed.

Delhayelite is orthorhombic with a 6·53, b 24·65, c 7·04 Å. Possible space-groups Pmn21 and Pmmn. Weak super-cell with doubled a-axis. Distinct cleavage parallel to (010). Birefringence weak. α ≈ β ≈ γ = 1·532. 2Vα = 83°. Optical orientation: a = α, b = γ, c = β. Sp. gr. 2·60. Chemical composition corresponds to the tentative formula (Na,K)4Ca5Al6Si32O80.18H2O.3(Na2,K2)(Cl2,F2,SO4).

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 244 , March 1959 , pp. 6 - 9
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1959

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References

Gard, (J. A.) and Taylor, (H. F. W.), 1957. Min. Mat., vol. 31, p. 611.Google Scholar
Mounttain, (E. D.), 1957 Ibid., vol. 31, p. 607.Google Scholar
Saihama, (Tg. G.) and Hytönen, (Kai), 1957a. Ibid., vol. 31, p. 503.Google Scholar
Saihama, (Tg. G.) and Hytönen, (Kai) 1957b. Ibid., vol. 31, p. 698.Google Scholar
Saihama, (Tg. G.) and Meyer, (A.), 1958. Exploration du Pare National Albert, Mission d'études vuleanologiques, Fuse. 2.Google Scholar