Abstract: A tile for flooring or wall cladding has a relatively thin stone layer 11 bonded to a substrate made up from three sub-layers 13A, 13B and 13C each of substantially the same shape and size as the stone layer 11. The sub-layer 13A adjacent the stone layer 11 is aligned with the latter, the intermediate sub-layer 13B is displaced in two directions to define two projecting tongues 16,17 from two edges, and two grooves on the opposed edges. The outer sub-layer 13C is displaced in one direction to define a projecting tab 22 provided with fixing holes 23. The aligned sub-layer 13A may be omitted, if not required.The tiles may be much thinner, and hence much lighter, than conventional stone slabs for flooring or wall cladding, on account of the strength imparted by the substrate. The tiles allow for invisible fixing, with the projecting tongues interlocking in the grooves of the adjacent tiles.