Building Construction
The size of a floor tile commonly used, is

20 cm × 20 cm × 2 cm
All listed here
22.5 × 22.5 cm × 2.2 cm
15 cm × 15 cm × 1.8 cm

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Building Construction
Slate

Has a smooth surface and contains alumina and silica
Splits into thin sheets along its bedding planes
Is a metamorphic rock
Possesses good water absorption capacity

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