I'm pretty sure that's just an unglazed porcelain 2" hex tile. It's a little harder than glazed tile to keep clean, but more authentic on floors and less slippery.

Hello heathersanta! It's hexagon marble mosaic tiles and if you like marble look then we can advise you to check marble hexagon mosic tiles: http://www.carraratiles.com/hexagon-marble-mosaic-tiles.html

No, it's not marble. It's unglazed porcelain ceramic tile.

How is the tile for cleaning. I really want to put it in my 1920 bath.