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.