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On an Epidote from Inverness-shire1

Published online by Cambridge University Press:  14 March 2018

H. H. Thomas
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Extract

The mineral to be described was found by Mr. C. T. Clough, M.A., of the Geological Survey, near the junction of the two large streams in Coire Dhorrcail, near Barrisdale on the south side of Loch Hourn, Inverness-shire.

Mr. Clough furnishes me with the following description of the mode of occurrence of the mineral :—

‘The crystals were obtained from a band, which, although its sides are not well exposed, seems to form a nearly horizontal vein-like mass. This band crosses both the bedding and the foliation planes of the muscovite-biotite-gneiss in which it occurs, and which occupies a large area near Barrisdale and Ladhar Bheinn.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 14 , Issue 64 , May 1905 , pp. 109 - 114
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1905

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Footnotes

1

Communicated by permission of the Director of H.M. Geological Survey.

References

Page 109 note 2 Ordnance Survey of Scotland, one inch map, sheet 6l.

Page 109 note 3 Summary of Progress for 1900 (Memoir Geological Survey), 1901, p. 10.

Page 110 note 1 Forbes, E. H., Amer. Journ. Sci., 1896, ser. 4, vol. i, p. 26 CrossRefGoogle Scholar.

Page 110 note 2 Laspeyres, H., Zeits. Kryst. Min., 1879, vol. iii, p. 562 Google Scholar.

Page 111 note 1 Verh. russ. rain. Ges., 1880, ser. 2, vol. xv, p. 47. The position taken above is that used in Dana's ‘System of Mineralogy,’ 6th edit., 1892, p. 516.

Page 112 note 1 The refractive index of the oil for sodium-light = 1.60273 at 18°C.

Page 112 note 2 The refractive index of the oil for thallium-light = 1.61461 at 18°C.

Page 113 note 1 H. Laspeyres, loc. cit.

Page 113 note 2 vom Rath, G. [Grey epidote from Val Maigels], Zeits. Deutsch. geol. Gesell., 1862, vol. xiv, p. 428 Google Scholar. See also Weinschenk, E., ‘Ueber Epidot nnd Zoisit,’ Zeits. Kryst. Min., 1896, vol. xxvi, p. 176 Google Scholar.

Page 113 note 3 Klein, C., Neues Jahrb. Min., 1874, p. 1 Google Scholar.

Page 113 note 4 E. H. Forbes, loc. cit.