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On the occurrence of Phenacite and Scheelite at Wheal Cock, St. Just, Cornwall

Published online by Cambridge University Press:  14 March 2018

Arthur Russell
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Extract

James Sowerby in his ‘British Mineralogy’ describes and figures sider the head of ‘Argilla electrica’ or ‘White Tourmaline’ a mineral which was undoubtedly phenacite. The specimen was sent to Sowerb,y by a Mr. Herbert in 1804, and was said to have been found in a mine in St. Just, Cornwall. According to Sowerby's description and from the eoloured plate which he gives of the specimen, the mineral occurred as long-prismatlc, colourless crystals , some of which were doubly terminated and lying upon and partly penetrated by mass of prismatic quartz crystals. The crystals were ‘so divided by cracks and flaws in general as to appear of an opaque whiteness in parts’.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 19 , Issue 88 , March 1920 , pp. 19 - 22
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1920

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References

page 19 note 1 Sowerby, J., British Mineralogy, 1809, vol. 4, plate 831, pp. 58–54.Google Scholar This work was issued in parts between 1802 and 1817 ; the title-page of vol. 4 bears the date 1811, whilst the plate referred to is dated 1809. It may here be mentioned that as a whole the plates in Sowerby's work are, e.onsidering the date bt which they were executed, extremely true to nature and compare favourably with many of the much more recent attempts at pictorially depictin 8 mineral specimens, while the text contains the record of many occurrences which were new to that period of minera}ogical knowledge.

page 19 note 2 In another part of Scwerby's work (vol. 4, p. 29) Mr, Herbert is referred to as 'a very ingenious collector, of Bristol'.

page 20 note 1 Russell, A., On the ocourence of phenacite in Cornwall. Mineralogical Magazine, 1911, vol. 16, pp. 55–02.Google Scholar

page 22 note 1 Le Neve Foster, C., Mineralogical Magazine, 1877, vol. 1, p. 74.Google Scholar