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Calcite crystals from Holywell, North Wales

Published online by Cambridge University Press:  14 March 2018

E. D. Mountain
E. D. Mountain*
Affiliation:
Mineral Department of the British Museum
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Extract

In September 1923 a visit to the lead-mining district of Holywell, Flintshire, so closely associated with the name of Thomas Pennant, was organized by Mr. Campbell Smith in order to examine the abandoned workings with a view to collecting specimens. The occurrence of the ores has been described in detail by Sir Aubrey Strahan and Mr. Bernard Smith, and reference to many mineral localities, mentioned by Pennant, is made by Mr. Campbell Smith (loc. cit.).

The commoner specimens collected consist of ruby-blende (Talargoch mine), botryoidal and pseudomorphous calamine ZnCO3 (Milwr mine), orange and reddish-mauve fluor with bitumen and blende (Bryn-gwiog mine).

Calcite also occurs abundantly in veins and cavities throughout the limestone, the crystals usually consisting of large modified obtuse rhombohedra.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 20 , Issue 105 , June 1924 , pp. 212 - 216
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1924

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References

Page 212 note 1 Campbell Smith, W., Min. Mat, 1913, vol. 16, p. 331.CrossRefGoogle Scholar

Page 212 note 2 ‘Geology of the neighbourhoods of Flint, Mold, and Ruthin.’ Mem. Geol. Survey, 1890, p. 159.

Page 212 note 3 ‘Lead and zinc ores in the Carboniferous rocks of North Wales.’ Special Reports on the Mineral Resources of Great Britain, Mem. Geol. Survey, 1921, vol. 19.

Page 214 note 1 Whitlock, H. P., Proc. Amer. Acad. Arts Sci., 1915, vol. 50, p. 352 CrossRefGoogle Scholar. [Min. Abstr., vol. 1, p. 348.]