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Apophyllite from Traprain Law, East Lothian

  • J. G. C. Anderson (a1) and S. Elder (a1)

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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.

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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 ; and by MacGregor, A. G. and Ennos, F. R., The Traprain Law phonolite. Geol. Mag., 1922, vol. 59, pp. 517-519.

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

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

Apophyllite from Traprain Law, East Lothian

  • J. G. C. Anderson (a1) and S. Elder (a1)

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