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Yellow apophyllite from Korsnäs, Finland

Published online by Cambridge University Press:  14 March 2018

Th. G. Sahama
Th. G. Sahama*
Affiliation:
University of Helsinki, Finland
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Summary

The honey-yellow apophyllite from Korsnäs, Finland, for which chemical, optical, and X-ray data are given, shows a complex twinning. An inner penetration twin is surrounded by two outer penetration twins. The twin laws have been established. The prism faces of the complex crystal are not (100) as conventionally taken for apophyllite but (520). The spacegroup P4/mnc commonly accepted for apophyllite could not be confirmed. It is suggested that the mineral is only pseudotetragonal, the true symmetry possibly being orthorhombic with space group Pnn2 or Pnnm.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 406 - 415
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

Gossnner, (B.) and Kraus, (O.), 1928. Z. Krist., vol. 68, p. 595.Google Scholar
Taylor, (W.H.) and Náry-Szabó, (ST.), 1931. Ibid., vol. 77, p. 146.Google Scholar