Holman's Test Mine - Geology
Introduction
The photograph on this page of Holman's Test Mine - Geology by Ashley Dace as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk
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Image: © Ashley Dace Taken: 7 Feb 2014
A quartz hematite vein with argillised alteration zone. Hydrothermal fluids have altered the feldspars in the granite to clays (kaolinite - China Clay). The black vein (tourmaline) doesn't cross cut this (it is earlier).
Image Location
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