Across
- 2. can be mined from the position in which they decomposed from the parent rock
- 5. a classification of a property which can be possessed by any clay
- 8. clay with low plasticity
- 9. in plastic clay there is also water in the holes between the particles
- 12. granite bosses which form upland areas
- 13. will not withstand high temperature but break down with heat and melt before
- 15. will withstand a high temperature without deformation
- 19. fired to provide a strong product which is porous
- 20. have an end product of clay
- 22. the capacity to withstand thermal shock
Down
- 1. tend to be short when they are sufficiently pure and white
- 3. can be stained with metal oxides and prepared stains to give other colours
- 4. complex mixture and combination of minerals
- 6. mature slowly during firing
- 7. are silicate minerals of similar plate-like structure to kaolinite
- 8. have been deposited in their present position by the action of water and ice
- 10. contain iron oxide in reduced state
- 11. previously sedimented clays which have been subjected to pressure
- 13. often added to bodies for the textural effects
- 14. are also used for slipware
- 16. a rust from red iron oxide
- 17. include china clay for whiteness and some ball clay for whiteness and some ball clay for strength
- 18. by hydrolization becomes clay, silica, and a salt
- 21. the end products of a chain of reactions