Shelly !
Marble is too soft for a kitchen floor and, my opinion, the tile industry has come a long way and offers in a porcelain tile the marble look alike that is bullet proof, in fact the only way that a person can tell is by looking at the ends. What has been done is all digital, in other word some tile manufactures have taken digital picture of real marble already installed and computerized this into a ( ink jet ) printed picture. Using this, you cannot tell if the product is real or not, you should check this out really I was amazed. I have already installed this type of porcelain in the travertine nock off on floors and you can,t see the difference, my cost was its not cheap, 6.00 and up per sf but worth it