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Exploring Dartmoor, Cornwall, and the Journey of China Clay

This text delves into the geological and cultural significance of various locations in Devon and Cornwall, particularly focusing on Dartmoor, a National Park characterized by its granite tors. It highlights the craftsmanship of porcelain in Stoke-on-Trent and the historical export of china clay from Fowey. The connection between weathered granite and kaolin clay is also explored, along with insights into the Eden Project's innovative use of a former china clay pit. This narrative intertwines nature, industry, and history, showcasing the rich heritage of these regions.

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Exploring Dartmoor, Cornwall, and the Journey of China Clay

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Presentation Transcript

  1. What connects all of these images? 1 2 3 4 5 6 8 9 7

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  11. This is a ‘tor’ on Dartmoor • Dartmoor is a National Park in Devon • The underlying rock is granite • Tors are found on hilltops and are the result of weathering of the granite

  12. This cup is made of porcelain • Fine porcelain is known as bone china • It was made in Stoke on Trent • Bone china is made from bone ash, china stone and china clay

  13. This harbour is Fowey (pronounced ‘Foy’) • It is in the south of Cornwall • It used to export china clay • Much of Cornwall’s china clay went by sea to Liverpool

  14. This is a close up of a piece of granite • Granite comprises three types of minerals: quartz is clear and greyish like glass mica is black and shiny feldspar is white (sometimes pink) • The feldspar can be weathered by a process called ‘kaolinisation’ • Many of the upland areas in Cornwall are underlain by granite

  15. This cone is in Cornwall • It is not a volcano! • It is made of quarry waste

  16. This is a pottery factory in Stoke on Trent • It has been preserved as a museum • The ‘chimneys’ are bottle ovens where porcelain was fired • Stoke on Trent was linked by canal and railway to the port of Liverpool

  17. This is a disused china clay pit in Cornwall • China clay was quarried using powerful jets of water to break up weathered (kaolinised) granite • The china clay (kaolin) then dried out as a powder

  18. This is the Eden Project near St Austell in Cornwall • It is located in a former china clay pit • Inside one of the ‘biomes’ there is a real living, growing rainforest

  19. These are granules of china clay or kaolin • When granite is weathered, the feldspar crystals within it break down into china clay or kaolin • China clay is an important ingredient for porcelain manufacture

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