puzzle 5

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Across
  1. 3. If you add other things to clay after you dig it up you create what is called
  2. 4. lowers the amount of heat needed to melt silica
  3. 5. a microcrystalline form of quartz and has a completely different physical appearance
  4. 7. Fluxes and Hardeners are the most
  5. 9. the mineral form of silica powder used in ceramic glazes and clay bodies
  6. 13. can be rounded or angular, the latter being more suited to clay bodies
  7. 16. flux is an ________ that promotes ceramic fusion
  8. 17. Alters the vitrification temperature of the clay
  9. 18. feldspar fuses at
  10. 19. ________ fluxes are like sodium and lead oxides
Down
  1. 1. ________ fluxes are like calcium and magnesium oxide
  2. 2. The material that acts as a hardener in glass,glazes,clays and all ceramic materials
  3. 6. clay body is made of ____ components
  4. 8. the acceptable exceptions are
  5. 10. fluxes do not
  6. 11. fluxes are ________ that chemically formulate
  7. 12. Nepheline syenite melts at
  8. 14. a crystalline form of silica
  9. 15. Cornish stone melts at