Most any kind of granite will go with a slate floor, as long as there is a relationship between the two stones using a specific color or colors from the slate. Granite’s variety provides rich and bold colors, and choosing a contrasting color to the slate is another option. Depending upon the color of the slate flooring, pull out one or two colors from the slate to use as a color theme for picking the granite.
Gray or black slate typically has dark streaks of gray or black with hints of blues, greens and sometimes tan or gold. Choose a granite that brings these colors together in a different way; instead of a dark background, choose a granite that has a lighter background but colors that match the slate in the foreground, such as Mountain Green composed of flecks of black and green or Paradiso with flecks of black streaked with deeper red-browns and tans. The idea is to use a nondominant color from the slate and repeat it in the granite.
Because the floor is a lighter color, you may want to provide a contrasting color with the granite such as Jalor Café, a dark brown granite flecked with gold and black, or you may prefer matching the flooring colors. Use a New Venezia granite in this scenario, pulling in white, golds, blacks and tans in the granite to match some of the colors of the slate.
Because granite is polished and smooth, its texture provides a contrast to the swirls, rough texture and uneven patterns often found in slate. Make a bold statement by using black granite with tan floors. If you use black granite with gray slate, this may be too much of a dark color for your home. If your floor is dark gray or almost black, consider a lighter color for the granite to break up the dark flooring.