Marble is one of the least porous types of limestone, but its surface is soft. It can easily be scratched or chipped, especially by metal knives and pots. It also etches easily, which means that any acidic-based material will eat into the stone and create small scratches. Common kitchen items like lemon juice, soda cans, and coffee cups can easily etch a marble countertop. While tumbled or antiqued marble holds up better against scratches, expert do not recommend using polished marble for kitchen counters unless you are willing to live with some scratches on its surface.