Granite Definition: “A very hard, crystalline, igneous rock, grey to pink in color, composed mostly of feldspar and natural quartz” (Marble Institute of America) 1. Do seal your Granite countertops Even though the porosity ratio of Granites varies between .46% and 1.5%, I recommend sealing your Granite with a penetrating/impregnator sealer such as Seal & Go® … ∞