stone cladding: Grey lava stone from china

china lava stone ,with unique style , in addition to the general characteristics of ordinary stone , it also has sound-absorbing insulation , heat thermal storage , absorbent non-slip , acid, "breathing" and other special features , it can be widely used in various buildings facade.
honed finished for the surface treatment use on indoor or outdoor decoration ,not good for anti-slip but also show the antique style ,let people back to the before .