low radioactivity, noise reduction, bibulous prevented slippery, durable quality environmental protection stone material. Appearance:Color: grey to black: minute holes: density: 2600KGS/M3; consistent in colorSurface finishesAvailable in various surface finishes: honed, polished. Bush-hammered,brushed sandblast, chiseled, pineapple, waterjet, sawn and combination of different finishes. ...