We do not recommend the use of marble as kitchen counters because marbles (and limestone and travertine) are calcium carbonate, and their polished surface is more vulnerable to household acids including vinegar, mustard, ketchup, citrus and a host of other food-related products. These acidic substances cause a chemical reaction, which will remove the polish. Additionally, marble and limestone can be scratched more easily than harder stones such as granite.
Marble is, however, sometimes used in the kitchen as a pastry slab; its perfectly smooth, cool surface is ideal for rolling out dough and piecrusts.