Cockercombe Tuff is a greenish-grey, hard pyroclastic rock, formed by the compression of volcanic ash containing high quantities of chlorite, which gives it its distinctive colour. It is found almost exclusively in the south-eastern end of the Quantock Hills near Cockercombe, Somerset, England from where it has been quarried for centuries.
- Prudden, Hugh. "Somerset building stone guide" (PDF). Somerset Archaeological and Natural History Society. p. 4. Retrieved 16 July 2011.
- Haslett, Simon K. (2010). Somerset Landscapes: Geology and landforms. Usk: Blackbarn Books. p. 50. ISBN 9781456416317.
- Brenchley, P.J.; Peter Franklin Rawson (2006). The geology of England and Wales. Geological Society. p. 242. ISBN 978-1-86239-200-7.
- "Over Stowey Parish Design Statement" (PDF). Sedgemoor District Council. Retrieved 16 July 2011.
- "Strategic Stone Study: A Building Stone Atlas of Somerset and Exmoor" (PDF). English Heritage. Retrieved 11 October 2011.
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