Here is a bit of information about marble flooring:
Marble can be tracked up to the area where it was extracted from. There is a big difference between marble floors from South & North of Italy.
Marble floors cost a lot of money. If you are worry about the cost of getting the tiles then you cant afford it. After your floor was fitted you will have to pay for cleaning , polishing & sealing. It is a no ending process. People should consider this before getting marble floors fitted. We meet many people that own great quality floors only to cant afford to polish it.
Marble floors stain. Avoid washing your floors with bleach or any strong cleaning agent. Citric acid is also a killer for marble floors, it stains , it marks and it kills the shine.