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On tilleyite and its associated minerals from Carlingford, Ireland (With Plates XI and XII.)

Published online by Cambridge University Press:  14 March 2018

S. R. Nockolds  and
H. G. C. Vincent
S. R. Nockolds
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
H. G. C. Vincent
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Extract

The mineral tilleyite was first discovered by Larsen and Dunham in thermally metamorphosed limestones from the contact zone at Crestmore, California. It is associated there with merwinite, wollastonite, spurrite, and gehlenite, and the rock is traversed by streaks of idocrase with grossular. The amount of tilleyite in these rocks was apparently small, but in certain thermally metamorphosed limestones from Carlingford it is abundant and some specimens are practically pure tilleyite-rocks, it has been possible, therefore, to make a more detailed optical and chemical examination of this mineral. The tilleyite occurs as subidioblastic crystals when abundant, or as rounded grains in calcite-rich rocks, or as irregular plates.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 198 , September 1947 , pp. 151 - 158
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1947

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References

page 151 note 1 Larsen, E. S. and Dunham, K. C., Tilleyite, a new mineral from the contact zone at Crestmore, California. Amer. Min., 1933, vol. 18, pp. 469–473. [M.A. 5–387.]Google Scholar

page 153 note 1 Prof. Tilley has also found this orientation in tilleyite occurring in metamorphosed limestones from the Island of Muck. C.E. Tilley, The gabbro-limestone contact zone of Camas Mòr, Muck, Inverness-shire. Bull. Comm. Géol. Finlande (Eskola volume), 1947 (in press).

page 156 note 1 Wright, F. E., Amer. Journ. Sci., 1908, ser. 4, vol. 26, p. 545.CrossRefGoogle Scholar

page 157 note 1 Osborne, G. D., The metamorphic limestones and associated contaminated igneous rocks of the Carlingford district, Co. Louth. Geol. Mag., 1932, vol. 69, pp. 209–233. [M.A. 5–134.]CrossRefGoogle Scholar

page 157 note 2 ‘Custerite’ = cuspidine, Tilley, C. E., Mill. Mag., 1947, vol. 28, p. 91.Google Scholar

page 158 note 1 Bowen, N. L., Progressive metamorphism of siliceous limestone and dolomite. Journ. Geol. Chicago, 1940, vol. 48, pp. 225–274. [M.A. 8–243.]CrossRefGoogle Scholar