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On the occurrence of nacrite at Shap, Westmorland

Published online by Cambridge University Press:  14 March 2018

R. J. Firman
R. J. Firman*
Affiliation:
Department of Geology, Durham Colleges in the University of Durham
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Extract

During a recent investigation of the hydrothermal mineralization associated with the Shap granite, nacrite was found in a quartz vein in the Shap Blue quarry. This quarry has been opened for roadstone in the metamorphosed Borrowdale lavas, 700 yards north of the granite contact on the west side of the Penrith-Kendal road, three miles south of Shap village. Further examination showed that nacrite often coats shear joints in fault breccias and shatter belts in the metamorphosed andesites. It is associated with chlorite, haematite, pyrite, and traces of erythrite, and often with later quartz, calcite, and baryte veins.

Nacrite from this locality occurs as microcrystalline aggregates on joint faces, usually only in thin layers but layers up to 5 mm. thick have been found.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 222 , September 1953 , pp. 199 - 200
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1953

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References

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