Also known as / varieties
Slate schist or phyllite / ottrélite.
Ardennes, province of Luxembourg.
Combination of dominant clayey minerals, siliceous, ferruginous and alumniferous minerals.
Maximum dimensions of rough blocks
Length 3 m; width 2 m; thickness 1 m.
Minimum thickness for application
1 cm - roofing slate 0,2 cm.
Untreated, split, sawn, honed, polished, even carved in the case of Ottré stone.
Outside : rubble stone, corner, voussoir, window and door sill, sill, step, wall coping, floor tile, furniture, roofing slate and wall covering.
Inside : counter top, floor tile, interior decoration.