A pencil edge on an Impala Black Granite countertop refers to a particular type of edge profile, also known as a pencil round or quarter round. It is a slightly rounded edge that is created by cutting and shaping the edges of the granite slab at a 90-degree angle and then rounding off the top and bottom edges with a small radius. This edge profile gives the countertop a smooth and subtle curve, providing a timeless and elegant look to the granite surface.