"Slate tiles" refers to flat pieces of rock, specifically slate, that are cut into square or rectangular shapes and used as a type of flooring or roofing material. Full definition
It was spacious and stylish with slate tiled floors and modern art. (neverendingvoyage.com)
The bathroom has five - star appeal, with slate tiles in varying sizes adding interest, and a wall and vanity unit in rich wood bringing warmth to the scheme. (idealhome.co.uk)
She chose slate tiles for the kitchen floor to separate this space from the living area. (idealhome.co.uk)