Granite-marble confusion on FN
Alton Brown usually seems to do good research, but he gave some very dubious advice on Saturday's Kitchen Makeover show. He recommended the couple use marble for their countertops and said marble was compressed granite, which is ludicrous. Granite is igneous, marble is metamorphic limestone, The importance? Marble is more porous and thus is not usually recommended for countertops because it stains easily. If you want stone, go with granite.
We have granite counter tops and a marble pastry board. They look a lot alike but there is a big difference. Marble dissolves in acid and so the marble pastry board gets a white deposit on the surface if we spill lemon juice or vinegar on it. Granite does not.
My understanding is that the kitchen he was designing was for a professional chef in culinary school. Someone like that might be more apt to reseal the marble regularly and take care of it. But yes, marble is not practical for the average kitchen.