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Apophyllite from Traprain Law, East Lothian

Published online by Cambridge University Press:  14 March 2018

J. G. C. Anderson  and
S. Elder
J. G. C. Anderson
Affiliation:
University of Glasgow
S. Elder
Affiliation:
University of Glasgow
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Extract

Introduction and mode of occurrence.-During a visit in 1929 to the well-known phonolitic laccolith of Traprain Law, East Lothian, beautiful crystals of apophyllite were discovered in drusy cavities. It was found possible to collect numerous specimens which are now in the Hunterian Museum, University of Glasgow (M 5970). There is no previous record from the locality and the following is a brief description of the rock and its associates.

Along with the apophyllite occur well-formed icositetrahedra of analcime. A thin section reveals that the apophyllite is of later crystallization than the analcime. The latter mineral lines the walls of the cavities, with which the apophyllite is seldom in contact. Radiating fibres of pectolite are occasionally seen on the surface of the analcime.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 24 , Issue 149 , June 1935 , pp. 90 - 91
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1935

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References

page 90 note 1 Analcime as a primary constituent of the phonolite has been recorded by Bailey, E. B., The geology of East Lothian, Mem. Geol. Surv. Scotland, 1910, p. 129 Google Scholar; and by MacGregor, A. G. and Ennos, F. R., The Traprain Law phonolite. Geol. Mag., 1922, vol. 59, pp. 517-519.Google Scholar

page 91 note 1 Heddle, M. F., Mineralogy of Scotland. Edinburgh, 1901, vol. 2, pp. 81-82.Google Scholar

page 91 note 2 Tyrrell, G. W., Some dolerite-sills containing analcite-syenite in central Ayrshire. Quart. Journ. Geol. Soc. London, 1928, vol. 84 Google Scholar. The apophyllite is not mentioned by the author, but is referred to in the discussion by Dr. H. H. Thomas (p. 568).