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On an Analcite-basalt from Rathjordan, Co. Limerick

Published online by Cambridge University Press:  14 March 2018

G. T. Prior
G. T. Prior*
Affiliation:
British Museum
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Extract

Amongst the rock-specimens from Co. Limerick belonging to the Allport Collection in the British Museum, a. specimen of basalt from Rathjordan, Co. Limerick, attracted attention by the fact that, in thin slices under the microscope, it showed small, round sections of isotropic material containing central and octagonally arranged, marginal inclusions, and thus resembling leucite. The rock from Rathjordan has been described by Hull and by Allport. According to Allport the rock is a columnar, fine-grained, black basalt which occurs interbedded with ashes, and consists of ‘innumerable small grains of augite and magnetite set in an amorphous glass, the whole forming a matrix in which serpentinous pseudomorphs of olivine and felspar are porphyritically imbedded’.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 15 , Issue 71 , March 1910 , pp. 315 - 317
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1910

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References

Page 315 note 1 Similar characters were shown by thin slices of rocks from ‘hill above Nicker, one mile south-west of Pallas Station, Co. Limerick’, kindly placed at my disposal by Professor Grenville A. J. Cole and Professor H. J. Seymour.

Page 315 note 2 Hull, E., Geol. Mag., 1873, vol. x, p. 157 Google Scholar and Plate VIII, fig. 9.

Page 315 note 3 Allport, S., Quart. Journ. Geol. Soc., 1874, vol. xxx, p. 552 Google Scholar.

Page 316 note 1 Pfohl, F. in Hibsch, J. E., Min.-Petr. Mitt. (Tsehermak), 1894, vol. xiv, p. 111.Google Scholar

Page 316 note 2 Cross, W., Journ. Geol. Chicago, 1897, vol. v, p. 689.Google Scholar

Page 317 note 1 Evans, J. W., Quart. Journ. Geol. Soc., 1901, vol. lvii, p. 38 CrossRefGoogle Scholar.

Page 317 note 2 Lindgren, W., Proc. Calif. Acad. Sci., 1890, ser. 2, vol. iii, p. 51 Google Scholar.

Page 317 note 3 Cross, W., Journ. Geol. Chicago, 1897, vol. v, p. 684 CrossRefGoogle Scholar.