MARBLE   Marble is a limestone that has been crystallized by heat and pressure to a hardness that can be highly polished. Pure marble is white, but in various locations throughout the world, local impurities in the limestone host rock cause natural patterns and coloring that are distinctive and make each piece truly unique. Because of this, patterns and colors can vary with a flow and beauty only found in natural stone. Rainforest Brown Planking Teakwood Planking