Riverstone Phyllite is a unfading in nature and naturally non-porous, silver light grey with sheen phyllite rock quarried in Switzerland. This stone is especially good for custom flooring, exterior paving, interior or exterior cladding, stair treads, risers, baseboard, window stools, window sills, coping and roofing and other design projects. It also called Riverstone Grey Phyllite . Riverstone Phyllite can be processed into Sawn cut, Honed, Natural, Split, river worn, feature rocks and so on.