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