... , can be used outside.6.No radioactivity, genuine black slate. Material Name:Black Slate SlabsPlace of Origin:ChinaColor:BlackTechnicNatural slate.Character Popular ... , Floor, Wall)30.5x30.5x1.0cm (12"x12"x3/8")30.5x30.5x1.2cm (12"x12"x1/2")40.0x40.0x1.0cm ... Wood Vein.4) Main supplier of Granite: Black Diamond, Imperial Pearl , Pearl White, Green Basalt, Black Basalt, and G684, G654,G603, G688,G682 ...