Samya Ceramics puzzle 2

5. also added to bodies for textural effect
8. clays that occur in their place of origin
10. red clays of a fine, sandy texture
12. opposite of refractory clays
13. make up about 40% of earth's continental crust
15. common type of felsic intrusive igneous rock
17. can be mined in the position they decomposed
18. fired to provide a strong product which is porous and is covered by waterproof skin of glaze
20. includes china clay for whiteness and some ball clay for strength and plasticity
22. form a major component of the rock and earths crust
23. contains iron oxide in reduced state
24. soft phyllosilicate group of minerals
25. rarely textured

1. used for tin-glazed ware
2. have the capacity to withstand thermal shock
3. natural clays fire to white, cream and brown, but clays can be stained with metal oxides and prepared stains to give other colours.
4. mature slowly during firing
6. secondary clay
7. rust red from iron oxide
9. layered silicate clay mineral
11. resembles clay in its plasticity
14. clays of low plasticity
16. withstands high temperature without deformation
19. previously sedimented clays which have been subjected to pressure
21. added to bodies for textural effect