SSQ is a leading supplier and producer of natural slate products for architectural and roofing applications. Our slates are backed by reputable guarantees, as well as a 35-year track record of proven performance. SSQ's flagship Riverstone® is a phyllite - harder, denser and stronger than slate. Phyllite is the perfect stone for flooring, cladding, stairs, skirtings, worktops, copings, swimming pools, sills and patios.