Slate is non-absorbing, so it will not stain and requires very little maintenance. Colored concrete is becoming very popular and will offer the equivalent thermal mass and maintenance-free durability of slate. Concrete can easily be cast into any unique countertop shape. Granite has always been a popular choice for upscale countertops. It is not as heavy as the concrete or slate, but still has adequate thermal mass for efficiency and comfort.
Granite is available in a wide variety of colors and patterns.
It is a porous material and it must be sealed periodically. Ceramic tile is an excellent countertop material because of its durability and decorative patterns. If the tiles are set in a heavy mortar base, its natural heat transfer properties can be effective. Ones with a color glaze look brilliant, but scratches are less apparent on natural unglazed tiles. Engineered stone is another option and is often more reasonably priced.