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Augite from Bail Hill, Dumfriesshire

Published online by Cambridge University Press:  14 March 2018

Alexander Scott
Alexander Scott*
Affiliation:
University of Glasgow
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Extract

The crystals to which this paper refers are found at Bail Hill, about three miles north of Sanquhar, in Dumfriesshire. At this locality volcanic rocks of Arenlg age outcrop in the midst of the greywacke of the Southern Uplands. The rocks are mainly lavas, and include some coarse-grained tufts which are composed chiefly of augite- and hornblendeandesites. Ill the andesitic fragments, there arc numerous porphyritic crystals of a black augite, which call be easily separated from the rest of the rock. Isolated crystals of augite and hornblende occur also in the matrix of the tufts. No mention of this occurrence is made in Heddle's 'Mineralogy of Scotland', and apparently the only reference to it in previous literature is the short petrographic description in the Geological Survey Memoir.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 17 , Issue 79 , July 1914 , pp. 100 - 110
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1914

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References

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page 100 note 1 i. e. the acute angle between a and the s-s edge.

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page 107 note 1 Less than 0·006 per cent.

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