11. Vitrified tiles are recent trend to flooring.12. Vitrified stone has been found on the island close to the ruins of the castle.13. The stalls were paved with vitrified brick, and each had its own sewer connect. 14. Homogenous tiles are fully vitrified tiles. 15. Shales are occasionally thus altered by basalt dikes, and feldspathic sandstones may be completely vitrified . 16. When fired the pieces vitrified into an extremely hard, dense, non-porous material. 17. In previous shipments since 1992, blocks of vitrified waste were safely transported from Cherbourg to Japan. 18. During the firing in the kiln, the greenware and glaze are vitrified as one solid finished unit. 19. Porcelain, bone china and sanitaryware are examples of vitrified pottery, and are impermeable even without glaze. 20. Stoneware may be vitrified or semi-vitrified, the latter type would not be impermeable without glaze.
